You are standing 0.50 m in front of a lens that projects an image of you onto a

Question

You are standing 0.50 m in front of a lens that projects an image of you onto a wall 3.0 m on the other side of the lens.

Part A

What is the focal length of the lens?

Express your answer in meters to two significant figures.

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Part B

What is the magnification?

Express your answer to two significant figures.

You are standing 0.50 m in front of a lens that projects an image of you onto a wall 3.0 m on the other side of the lens.

Part A

What is the focal length of the lens?

Express your answer in meters to two significant figures.

f =   m  

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Part B

What is the magnification?

Express your answer to two significant figures.

m =

Explanation / Answer

do = object distance = 0.50 m

di = image distance = 3 m

f = focal length

Focal length is given as

1/f = 1/do + 1/di

1/f = 1/0.50 + 1/3

f = 0.43 m

magnification is given as

m = - di/do = - 3/0.5 = - 6

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