Problem 26.77 A concave lens has a focal length of -35cm . Find the image distan

Question

Problem 26.77

A concave lens has a focal length of -35cm . Find the image distance and magnification that results when an object is placed 20cm in front of the lens.

Part A

Express your answer using two significant figures.

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Part B

Express your answer using two significant figures.

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Problem 26.77

A concave lens has a focal length of -35cm . Find the image distance and magnification that results when an object is placed 20cm in front of the lens.

Part A

Express your answer using two significant figures.

di =   cm  

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Part B

Express your answer using two significant figures.

m =

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Explanation / Answer

we know,

1/u + 1/v = 1/f

1/v = 1/f - 1/u

1/v = -1/35 - 1/20

v = -12.73 cm (image distance)

here, "-" sign indicates the image is virtual

magnification, m = -v/u

= -(-12.73/20)

= 0.636

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