Question

For the same angle of incidence in media A,B and C, the angles 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

Hii friend,

# Answer- Media C 40° Refraction angle

# Explanation-

Snell's law gives relationship between refractive index, angle of incidence and angle of refraction.

µ = sin i / sin r

For same angle of incidence, as angle of refraction increases sin r increse which will further reduce refractive index.

Relationship between refractive index and velocity given by,

v=c/µ

Thus, lower the refractive index, higher the velocity of light through medium.

Ultimately higher angle of incidence implies higher speed of light.

From media a,b and c, media c have highest angle of refraction.

Thus from given options media c will carry light fastest.

Answer 2

From Snell’s law

n = sin i /sin r = c/v

Since c and sin i are constant therefore sin r is directly proportional to v

Therefore velocity of light is maximum in medium C.

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