Question

Number of waves in a 4cm thick glass slab are equal to the number of waves in 5cm thick water column. If refractive index of water is 4/3 then find the refractive index of the glass .​

Answer 1

Answer:

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Answer 2

Hello there !

We know that , the formula for the no. of waves is given by :

n = µ t / λ

where :

µ = refractive index

t = thickness

λ = wavelength

as ng = nw

µg x 4 / λ = µw x 5 / λ

µgx 4 = 4/3 x 5

µg = 4x5 / 4 x 3

µg= 5/3

Hence , the refractive index of glass is 5/3

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