Problem 27.48 A converging lens with a focal length of 3.7cm is to the left of a

Question

Problem 27.48

A converging lens with a focal length of 3.7cm is to the left of a second identical lens. When a feather is placed 12cm to the left of the first lens, the final image is the same size and orientation as the feather itself.

Part A

What is the separation between the lenses?

Express your answer using two significant figures.

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Problem 27.48

A converging lens with a focal length of 3.7cm is to the left of a second identical lens. When a feather is placed 12cm to the left of the first lens, the final image is the same size and orientation as the feather itself.

Part A

What is the separation between the lenses?

Express your answer using two significant figures.

SubmitMy AnswersGive Up

Explanation / Answer

Apply 1/f = 1/p + 1/q for the first lens.

1/3.7 = 1/12 + 1/q

q = 5.35 cm

Therefore the distance between the lenses for the case of have a same size and orientation image is twice the above value.

2(5.35) = 10.7 cm

Round to 11 cm for two sig figs...

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