Question

the velocity of light in air is 3×10⁸m/s if the wavelength of light in air is 5000A⁰ calculate the wavelength of light in glass 3/2
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Answer 1

We know that refractive index of glass is 3/2

So speed of light in glass will be 2 x 10^8 m/s

now speed at constant time is directly proportional to wavelength

so s1w2= s2w1

thus 10^8 is common in both the sides so they cancel out

So 2 x 5000 = 3 x w2

w2 = 3333.33 A °