A) If your looking through the side of a large glass aquarium at a fish ( Glass

Question

A) If your looking through the side of a large glass aquarium at a fish ( Glass n=1.50, water n=1.33). The fish looks like it's 10 cm behind the glass. How far away is it really? (Ignore the refraction of the glass and concentrate on the water).

B) While looking at the tank, you're distracted by the bright reflection of the red EXIT sign behind you. The light looks a lot like a laser you had seen in lab which has a wavelength of 633nm, What is the minimum thickness of the glass between you and the fish?

Explanation / Answer

in question glass n should be 1.5

Consider refraction from water to glass

glass is denser so ray will bend towards the normal

so , sin i/sin r = 1.5/1.33

Let actual distance be a cm

After calculations a = 8.05 cm

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