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If a monochromatic light goes through 2 cm of glass or 2.25 cm of water, the optical path is the same. If refractive index of glass is 1.50, then what is the refractive index of water?

If a monochromatic light goes through 2 cm of glass or 2.25 cm of water, the optical path is the same. If refractive index of glass is 1.50, then what is the refractive index of water? Correct Answer 1.33

The product of refractive index of the medium & geometric distance travelled by the light in the medium is known as Optical Path. => nA=mB (m&n are refractive index of water & glass respectively and A&B are geometric distance of glass & water) => 2*1.50=m*2.25 => m=1.33.

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