Part A How far behind the concave lens should the film be placed? Use two signif

Question

Part A

How far behind the concave lens should the film be placed? Use two significant figures. (cm)

Part B

What is the linear magnification of this lens combination? Use two significant figures.

A simple camera telephoto lens consists of two lenses. The objective lens has a focal length f1 = 39.3cm . Precisely 36.4cm behind this lens is a concave lens with a focal length f2 = -10.2cm . The object to be photographed is 4.01 in front of the objective lens. How far behind the concave lens should the film be placed? Use two significant figures. (cm) What is the linear magnification of this lens combination? Use two significant figures.

Explanation / Answer

the focal length of objective f1 = 39.3 cm

the object distance is u1 = 4.01 cm

we know that

1/f1 = 1/u1 + 1/v1

or 1/v1 = 1/f1 - 1/u1

the linear magnification is

m = (v1/u1)

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