A beam of light passes from medium 1 to medium 2 to medium 3 as shown figure. What may be concluded about the three indices of refraction, `n_(1),n_(2),and n_(3)` ?

Options

A. `n_(3)gtn_(1)gtn_(2)`
B. `n_(1)gtn_(3)gtn_(2)`
C. `n_(2)gtn_(3)gtn_(1)`
D. `n_(2)gtn_(1)gtn_(3)`

Answer

d.

Explanation

Usin Snell's law, `n_(2) gt n_(1)` because `I gt r`,
`n_(2) gt n_(3)` because `e gt r`, and `n_(1) gt n_(3)` because `e lt i` .