Question

A thin beam of light enters a thick plastic sheet from air at an angle of 32.0° with the normal and continues in the sheet at an angle of 23.0° with the normal. What is the index of refraction of the plastic?

Answer 1

1.36

Step-by-step explanation:

`n_(air)` = Index of refraction of air = 1

`n_(plastic)` = Index of refraction of plastic = ?

i = angle of incidence in air = 32.0° deg

r = angle of refraction in plastic = 23.0° deg

Using Snell's law

`n_(air)` Sini =
`n_(plastic)` Sinr

(1) SIn32.0 =
`n_(plastic)` Sin23.0

`n_(plastic)` = 1.36