For same angle of incidence the angles of refraction for three different media A, B and C are `15^(@)` , `25^(@)` and `35^(@)` respectively. In which medium the velocity of light is minimum?

Explanation

The absolute refractive index of a medium is given by
`mu = (sini)/(sinr) (c)/(v)`
`"i.e", " " v = c(sini)/(sinr)`
Here, I = angle of incidence, r = angle of refraction, c = velocity of light in vacuum (constant), v = velocity of light in the required medium.
So, for same angle of incidence i, `v propto sinr.`
Therefore v mill be minimum for that medium where `sin r` i.e., r will be minimum.
In this case since angle of refraction r is minimum in medium A, velocity of light is minimum in this medium.