An object is located to the left of a concave lens whose focal length is -30cm .

Question

An object is located to the left of a concave lens whose focal length is -30cm . The magnification produced by the lens is m1= 0.35.

Part A

To decrease the magnification to m2 = 0.24, should the object be moved closer to the lens or farther away?

Part B

Calculate the distance through which the object should be moved.

Express your answer using two significant figures.

An object is located to the left of a concave lens whose focal length is -30cm . The magnification produced by the lens is m1= 0.35.

Part A

To decrease the magnification to m2 = 0.24, should the object be moved closer to the lens or farther away?

Part B

Calculate the distance through which the object should be moved.

Express your answer using two significant figures.

Explanation / Answer

m1 = -S1'/S1 = 0.35

S1' = 0.35S

1/S1 + 1/S1' = 1/F

1/S1 - 1/0.35S = -1/30

S1 = 55.8 cm

m2 = 0.24

-S2'/S2 = 0.24

S2' = -0.24S

1/S2 - 1/0.24S2 = -1/30

S2 = 95 cm

S2 > S1

moved farthe away

B)
S2 - S1 = 95-55.8 = 39.2 cm

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