(a) State Snell's law of refraction of light.
(b) A transparent medium A floats on another transparent medium B. When a ray of light travels obliquely from A into B, the refracted ray bends away from from the normal. Which of these two media A or B are optically denser and why ?

Explanation

Snell.s Law: The ratio of the sine of angle of incidence to the sine to angle of refraction is a constant for a light of given colour and for a given pair of media.
`(Sin i)/(Sin r) ` = Constant