a.real and inverted
b.real but not inverted
c.virtual and inverted
d.virtual but not inverted
A convex lens with a focal length of 10 cm produces an image of a object at 8 cm. The image will be?
d. virtual but not inverted.
For ur info., the object is between the 1st focal length n the optical centre of mirror, i.e., object dis. is less than 10 cm.
Reply:In this position the lens is used as simple microscope, another way of saying is a reading lens.
The image is enlarged, erect and virtual.
The answer is d.
Reply:C
Tuesday, July 14, 2009
A convex lens with a focal length of 10 cm produces an image of a object at 8 cm. The image will be?
Optics - Physics Please Help!?
Object O1 is 15.0 cm to the left of a converging lens of 10.0-cm focal length. A second lens is positioned 10.0 cm to the right of the first lens and is observed to form a final image at the position of the original object O1. (a) What is the focal length of the second lens? (b) What is the overall magnification of this system? (c) What is the nature (i.e., real or virtual, upright or inverted) of the final image?
Answers:
a) -11.1 cm
b) M = positive 2.50
c) virtual, upright
I tried to slove the problem( I drew the ray diagram, not to scale), but I keep getting stuck when I try to get the focal length. The farthest I came up to is finding the magnification for the first lens.(the farthest to the left.
Please tell me how to start of the problem to find the focal length for the second lens. (The rest I could do on my own)
Thanks in Advance!
Optics - Physics Please Help!?
The equation of the first lens is : 1/p + 1/q = 1/f
where p = 15.0 cm , q = ? , f = 10.0 cm.
Then q = f p/(p - f) = 30.0 cm.
The image of the first lens is object (virtual) for the second lens.
The equation of second lens is: 1/p' + 1/q' = 1/f'
where p' = -(q -f) = - 20.0 cm , q' = -(p+f) = - 25 cm
Then 1/f' = - 0,09 , and f' = - 11.1 cm
Answers:
a) -11.1 cm
b) M = positive 2.50
c) virtual, upright
I tried to slove the problem( I drew the ray diagram, not to scale), but I keep getting stuck when I try to get the focal length. The farthest I came up to is finding the magnification for the first lens.(the farthest to the left.
Please tell me how to start of the problem to find the focal length for the second lens. (The rest I could do on my own)
Thanks in Advance!
Optics - Physics Please Help!?
The equation of the first lens is : 1/p + 1/q = 1/f
where p = 15.0 cm , q = ? , f = 10.0 cm.
Then q = f p/(p - f) = 30.0 cm.
The image of the first lens is object (virtual) for the second lens.
The equation of second lens is: 1/p' + 1/q' = 1/f'
where p' = -(q -f) = - 20.0 cm , q' = -(p+f) = - 25 cm
Then 1/f' = - 0,09 , and f' = - 11.1 cm
Lenses Question. My Work Inside!?
Question: A diverging lens has a focal length of -32 cm. An object is placed 19 cm in front of this lens. Calculate (a) the image distance and (b) the magnification. Is the image (c) real or virtual, (d) upright or inverted, and (e) enlarged or reduced in size?
My Approach: for (a) I got di = -11.9 cm, (b) m = 0.63, (c) virtual - di is negative, (d) upright - magnification is positive, (e) reduced - magnification is less than 1.
Tell me if you get the same numbers or different numbers. I would like to know if I am approaching this question without making any errors? Thanks!
Lenses Question. My Work Inside!?
Wiki, not always my favorite source, has a great section on optics. The appropriate page (ref.) gives the formulas for image size and magnification, which you seem to have followed. Define S as distance, X as size, f as focal length, 1 as object, 2 as image.
1/S1 + 1/S2 = 1/f, so S2 = 1/(1/f - 1/S1)
magnification M = X2/X1 = -S2/S1 = f/(f-S1)
So for (a), (b), I get S2 (or di) = -11.922, M = 0.627.
Agree on (c), (d) and (e).
For me the hard part is keeping straight the signs of S1 and S2. S1, the object distance, is always positive. S2 is only positive if it is on the opposite side of the lens. So when S2 is negative (because S1 %26lt; f), they are both on the same side, and you have a virtual image.
Reply:Thanks for the choice! Report It
free survey
My Approach: for (a) I got di = -11.9 cm, (b) m = 0.63, (c) virtual - di is negative, (d) upright - magnification is positive, (e) reduced - magnification is less than 1.
Tell me if you get the same numbers or different numbers. I would like to know if I am approaching this question without making any errors? Thanks!
Lenses Question. My Work Inside!?
Wiki, not always my favorite source, has a great section on optics. The appropriate page (ref.) gives the formulas for image size and magnification, which you seem to have followed. Define S as distance, X as size, f as focal length, 1 as object, 2 as image.
1/S1 + 1/S2 = 1/f, so S2 = 1/(1/f - 1/S1)
magnification M = X2/X1 = -S2/S1 = f/(f-S1)
So for (a), (b), I get S2 (or di) = -11.922, M = 0.627.
Agree on (c), (d) and (e).
For me the hard part is keeping straight the signs of S1 and S2. S1, the object distance, is always positive. S2 is only positive if it is on the opposite side of the lens. So when S2 is negative (because S1 %26lt; f), they are both on the same side, and you have a virtual image.
Reply:Thanks for the choice! Report It
free survey
Please help with physics question! answers provided!?
Object O1 is 15.0 cm to the left of a converging lens of 10.0-cm focal length. A second lens is positioned 10.0 cm to the right of the first lens and is observed to form a final image at the position of the original object O1. (a) What is the focal length of the second lens? (b) What is the overall magnification of this system? (c) What is the nature (i.e., real or virtual, upright or inverted) of the final image?
Answers:
a) -11.1 cm
b) M = positive 2.50
c) virtual, upright
Please Explain how to get slove!
Thanks in Advance!
Please help with physics question! answers provided!?
just guess you have a 33.33333 percent chance of getting it right unless you have to show your work then you are out of luck
Answers:
a) -11.1 cm
b) M = positive 2.50
c) virtual, upright
Please Explain how to get slove!
Thanks in Advance!
Please help with physics question! answers provided!?
just guess you have a 33.33333 percent chance of getting it right unless you have to show your work then you are out of luck
Introduction to computers; help pLEASE AND THANK YOU :]?
40. Which program can be found in Windows Accessories feature?
A. Word
B. Notepad
C. Excel
D. My Documents
47. Basic information about a computer is found in ___________________?
A.System Properties
B.Accessories
C.Search
D.Documents
customize many features of a computer, it is helpful to use ___________.
A. the Start menu
B.the Accessories tool
C. the Programs menu
D the Control panel
49. If a file or folder is accidentally deleted, which of the following is possible?
A. the data is deleted immediately and permanently
B.the deleted data can be retrieved from Disk Cleanup
C.the deleted data can be retrieved in the Recycle Bin
D.none of the above
50. The earliest form of removable storage was _____________.
A.magnetic
B.optical
C.virtual
D.paper
Introduction to computers; help pLEASE AND THANK YOU :]?
40. notepad
47. system properties
48. control panel
49. the deleted data can be retrieved in the recycle bin
50. magnetic (not so sure)
Reply:40. Which program can be found in Windows Accessories feature?
-Notepad
47. Basic information about a computer is found in ___________________?
-System Properties
48.customize many features of a computer, it is helpful to use ___________.
-Control panel
49. If a file or folder is accidentally deleted, which of the following is possible?
-he deleted data can be retrieved in the Recycle Bin
50. The earliest form of removable storage was _____________.
-magnetic?
hope I'm right
lol
Reply:Omg are you serious?
B. Notepad
A.System Properties
D the Control panel
C.the deleted data can be retrieved in the Recycle Bin
I want to say paper but it's actually A.magnetic
Reply:word
system properties
control panel
can be retrieved in the recycle bin (it SHOULD read MAY be retrieved but oh well)
magnetic
A. Word
B. Notepad
C. Excel
D. My Documents
47. Basic information about a computer is found in ___________________?
A.System Properties
B.Accessories
C.Search
D.Documents
customize many features of a computer, it is helpful to use ___________.
A. the Start menu
B.the Accessories tool
C. the Programs menu
D the Control panel
49. If a file or folder is accidentally deleted, which of the following is possible?
A. the data is deleted immediately and permanently
B.the deleted data can be retrieved from Disk Cleanup
C.the deleted data can be retrieved in the Recycle Bin
D.none of the above
50. The earliest form of removable storage was _____________.
A.magnetic
B.optical
C.virtual
D.paper
Introduction to computers; help pLEASE AND THANK YOU :]?
40. notepad
47. system properties
48. control panel
49. the deleted data can be retrieved in the recycle bin
50. magnetic (not so sure)
Reply:40. Which program can be found in Windows Accessories feature?
-Notepad
47. Basic information about a computer is found in ___________________?
-System Properties
48.customize many features of a computer, it is helpful to use ___________.
-Control panel
49. If a file or folder is accidentally deleted, which of the following is possible?
-he deleted data can be retrieved in the Recycle Bin
50. The earliest form of removable storage was _____________.
-magnetic?
hope I'm right
lol
Reply:Omg are you serious?
B. Notepad
A.System Properties
D the Control panel
C.the deleted data can be retrieved in the Recycle Bin
I want to say paper but it's actually A.magnetic
Reply:word
system properties
control panel
can be retrieved in the recycle bin (it SHOULD read MAY be retrieved but oh well)
magnetic
Are you good in physical science?
test your knowledge....
1. which of the following values represents an index of refraction of an actual object?
a. o, b.1/2, c. 5/4
2. If you were driving toward the sun late in the afternoon, you can reduce the glare from the road by wearing sunglasses that only the passage of light that's
a. polarized in a vertical plane
b. dispersed in a vertical plane
c. dispersed in a spherical plane
3. A virtual image produced by a lens is always
a. larger than the object
b. located in front of the lens
c. located in the back of the lens
4. If the distance from a converging lens to the object is less than the focal length of the lens, the image will be
a. real, inverted, and larger than the object
b. virtual, upright, and larger than the object
c. virtual, upright, and smaller than the object
5. When a magnifying glass is used properly, the image will be formed
a inside focal length of lens
b 250 mm n front
c 500mm behind
Are you good in physical science?
Maybe:
1.b
2.c
3.d
4.b
5.a
Reply:If it were your homework you stuck in and not just an attempt to test our knowledge, I would try to answer some questions.
1. which of the following values represents an index of refraction of an actual object?
a. o, b.1/2, c. 5/4
2. If you were driving toward the sun late in the afternoon, you can reduce the glare from the road by wearing sunglasses that only the passage of light that's
a. polarized in a vertical plane
b. dispersed in a vertical plane
c. dispersed in a spherical plane
3. A virtual image produced by a lens is always
a. larger than the object
b. located in front of the lens
c. located in the back of the lens
4. If the distance from a converging lens to the object is less than the focal length of the lens, the image will be
a. real, inverted, and larger than the object
b. virtual, upright, and larger than the object
c. virtual, upright, and smaller than the object
5. When a magnifying glass is used properly, the image will be formed
a inside focal length of lens
b 250 mm n front
c 500mm behind
Are you good in physical science?
Maybe:
1.b
2.c
3.d
4.b
5.a
Reply:If it were your homework you stuck in and not just an attempt to test our knowledge, I would try to answer some questions.
Plz answer my question..vitual memory is a)portion of mem where OS resides b)another name of disk mem c)?
virtual memory is a)the portion of memory where Operating System resides b)another name for the disk mem c) a concept where by the user nedd not worry about the memory limitations
Plz answer my question..vitual memory is a)portion of mem where OS resides b)another name of disk mem c)?
Virtual memory is an extension of RAM where the OS utilizes allocated disk space for memory overflow. The good part is that this provides for more memory on your machine. The bad part is it is very slow in comparison to real memory. It also has the added need for the OS to swap out the memory instructions as it is utilized.
Reply:An imaginary memory area supported by operating systems in conjunction with the hardware. You can think of virtual memory as an alternate set of memory addresses. Programs use these virtual addresses rather than real addresses to store instructions and data. When the program is actually executed, the virtual addresses are converted into real memory addresses.
The purpose of virtual memory is to enlarge the address space, the set of addresses a program can utilize. For example, virtual memory might contain twice as many addresses as main memory. A program using all of virtual memory, therefore, would not be able to fit in main memory all at once. Nevertheless, the computer could execute such a program by copying into main memory those portions of the program needed at any given point during execution.
To facilitate copying virtual memory into real memory, the operating system divides virtual memory into pages, each of which contains a fixed number of addresses. Each page is stored on a disk until it is needed. When the page is needed, the operating system copies it from disk to main memory, translating the virtual addresses into real addresses.
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Plz answer my question..vitual memory is a)portion of mem where OS resides b)another name of disk mem c)?
Virtual memory is an extension of RAM where the OS utilizes allocated disk space for memory overflow. The good part is that this provides for more memory on your machine. The bad part is it is very slow in comparison to real memory. It also has the added need for the OS to swap out the memory instructions as it is utilized.
Reply:An imaginary memory area supported by operating systems in conjunction with the hardware. You can think of virtual memory as an alternate set of memory addresses. Programs use these virtual addresses rather than real addresses to store instructions and data. When the program is actually executed, the virtual addresses are converted into real memory addresses.
The purpose of virtual memory is to enlarge the address space, the set of addresses a program can utilize. For example, virtual memory might contain twice as many addresses as main memory. A program using all of virtual memory, therefore, would not be able to fit in main memory all at once. Nevertheless, the computer could execute such a program by copying into main memory those portions of the program needed at any given point during execution.
To facilitate copying virtual memory into real memory, the operating system divides virtual memory into pages, each of which contains a fixed number of addresses. Each page is stored on a disk until it is needed. When the page is needed, the operating system copies it from disk to main memory, translating the virtual addresses into real addresses.
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