What is the beetle’s actual distance beneath the surface?

A biologist keeps a specimen of his favorite beetle embedded in a cube of polystyrene plastic. The hapless bug appears to be 2.0 cm within the plastic.

Answer 1

You forgot to give the refractive index for the plastic .. assuming it is 1.60

For overhead viewing .. n = actual depth / apparent depth

actual depth d = n x app. depth = 1.60 x 2.0cm .. .. .. ►d = 3.20 cm

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