Question

A light beam travels with speed 10⁸ m/s in a medium. Find refrective index of medium and wavelength of light in medium if it is 6000 angstrom in air.​

Answer 1

Answer:In air velocity of light is 3×108m/s and wavelength is 6000Ao=6000×10−10m

We know that c=λ×f , f=frequency

3×108=6000×10−10×f

f=5×1014Hz

We know that refractive index n=velocityoflightinmediumvelocityoflightinvacuum​=vc​

Here c=3×108m/s

So 1.5=v3×108​

⟹v=2×108m/s

Since frequency does not change when light enters from one medium to other.

v=λf

2×108=λ×5×1014

λ=4×10−7m=4000Ao

Explanation:

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