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high school physics concave lens question?

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Topic: high school physics concave lens question? (Read 231 times)

Angela_Meyers

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Posts: 2

high school physics concave lens question?

« on: June 19, 2011, 11:25:37 PM »

A concave mirror has a focal length of f = 24 cm and a 6 cm tall object is placed in front of it. Find the image distance Di, the image height hi and the magnification m for each of the object distances listed below. Also indicate the type of image that is formed (real or virtual).
Object distance Do = 96 cm
Image distance Di?

Image height hi?

Magnification m?

Is the image real or virtual?
how do i figure out if its real or virtual??


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Alone_GuY

Newbie

Posts: 12

Re: high school physics concave lens question?

« Reply #1 on: June 20, 2011, 11:59:28 AM »

Object distance (u) = - 96 cm
Focal length (f) = 24 cm
Object height (O) = 6 cm

Now,
1/v + 1/u = 1/f
1/v - 1/96 = 1/24
1/v = 0.052
v = 19.23 cm

Image distance (v) = 19.23 cm
Let image height be I
Magnification = -v/u
Magnification is also equal to I/O
From above 2 equations
-v/u = I/O
- 19.23/96 = I/6
I (image height) = -1.201 cm

Magnification = I/O = -0.2

The image formed is real (because u > f) and inverted (because I is -ve)


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