Question

write 4 condition for total internal reflection.

Answer 1

For total internal reflection to occur, four conditions must be met:

1. The index of refraction must decrease across the boundary in the direction of light refraction.

2. The angle of incidence of the light ray must exceed the critical angle of the interface.

3. Angle of incidence (i) should be greater than critical angle (ic)
4. Ray should travel from denser medium to rarer medium.

Answer 2

For total internal reflection to occur, 2 conditions must be met:
1. The index of refraction must decrease across the boundary in the direction of light refraction. 2. The angle of incidence of the light ray must exceed the critical angle of the interface.

above two r important...
but in case if u need more..
U can look on these...too

1.The light should travel from a denser medium to a rarer medium.