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.
d_actual = ? cm
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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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