1. A flint glass plate ( n = 1.66) rests on the bottom of an aquarium tank. The

Question

1. A flint glass plate (n = 1.66) rests on the bottom of an aquarium tank. The plate is 8.50 cm thick (vertical dimension) and covered with water (n = 1.33) to a depth of12.5 cm. Calculate the apparent thickness of the plate as viewed from above the water. (Assume nearly normal incidence of light rays.)

2. An object is placed 71.0 cm from a screen.

(a) Where should a converging lens of focal length 8.5 cm be placed to form an image on the screen?

(b) Find the magnification of the lens.

Explanation / Answer

For near normal incidence .. Refractive index n = real depth / apparent depth

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