First slide

Ray optics

Question

The optical path of monochromatic light is the same if it travels 2 cm thickness of glass or 2.25 cm thickness of water. If the refractive index of water is 1.33, what is the refractive index of glass?

Easy

A

2.5
B

1.5
C

1.8
D

1.75

Solution

Optical path = μ × Path in medium.
The optical path for glass = Optical path for water.
μ_g = (1.33×2.25)/(2.0)
μ_g = 1.50.

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