Two lenses are placed 14 cm apart. The lens on the left has focal length f = -10

Question

Two lenses are placed 14 cm apart. The lens on the left has focal length f = -10 cm, and the lens on the right has focal length f = +10 cm. An object is placed 15 cm to the left of first lens. Where does the image from the lens on the left appear (ignore the lens on the right)? (A) 6 cm to the left of the lens (B) 3 cm to the left of the lens (C) 6 cm to the right of the lens Where does the image from the pair of lenses appear with respect to the lens on the right? (A) 20 cm to the right (B) 15 cm to the right (C) 13 cm to the right Is the final image upright or inverted with respect to the original object? (A) Upright (B) Inverted

Explanation / Answer

on the left the lens is diverging lens

so focal length is f = -10 cm

1/f = 1/do + 1/di

-1/10 = (1/15)+(1/di)

di = -6 cm

so the answer is

A) 6 cm to the left of the lens

41) the image of the left lense serves as the object for the right lens

so

1/f = (1/do)+(1/di)

1/10 = (1/(14+6)) + (1/di)

1/10 = (1/20)+(1/di)

di = 20 cm

so the answer is A) 20 cm to the right

42) after passing through the right lens,the image is Inverted with respect to the original object

so the answer is B) Inverted

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