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3A) A biconvex lens is made from transparent material of refractive index n = 1.60. The...

3A)

A biconvex lens is made from transparent material of refractive index n = 1.60. The power of the lens is +1.00 diopters. If the magnitude of the radius of one face is 12.0 cm, find the magnitude of the radius of the other face.

2.60 cm

15.0 cm

10.0 cm

21.4 cm          

3B)

An object placed 10.0 cm in front of a lens produces an image with magnification 2/3 ( = 0.667). At what distance in front of the lens should the object be placed to obtain a magnification of 1/4 (= 0.250)?

20.0 cm

60.0 cm

30.0 cm

10.0 cm
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