Question

for the same angle of incidence in media A B and C the angle of refraction are 20 degree 30 degree and 40 degree respectively in which medium will the velocity of light be maximum give reason in support of your answer

Answer 1

The speed of light will be maximum in medium C

If the velocity of light in the medium is v , refractive index is μ and c be the velocity of light in free space then we know that,

μ = c/v

=> v = c/μ

Now we know that refractive index is given by,

μ = sin i / sin r

Hence,

v = c sin r / sin i

since c and sin i are equal for all the mediums, hence

v ∝ sin r

Hence the greater the value of angle of refraction => the greater the value of speed of light in that medium

Hence the speed of light will be maximum in medium C as it has the highest value of angle of refraction(40°)

Answer 2

hey

the ray of light will be more at 40° because