A beam of light passing through crown glass (n = 1.5) strikes the surface between the glass and air and experiences total internal reflection. Which of the following changes would ensure that the light continues to experience TIR?

Question

Vocaloid · Answer

A) have the light originate in air
B) decrease the angle of incidence
C) immerse the glass in water
D) decrease the wavelength of light

pretty sure it's not A or B using Snell's Law/the critical angle equation but unsure between C + D

Vocaloid · Answer

Please do not comment unless you are making a serious attempt at the problem.

Gdeinward · Answer

I am fairly certain its D. I do not recall wavelength having any effect on TIR.