Question

Determine the critical angle for light travelling from water with a refractive of index 1.33 to air.

Answer 1

At angles larger than øc no light travels out of the slower medium; it is all reflected internally
so here
(1.33)sinøc = (1.003)sin90º
sinøc = (1.003)/(1.33)
øc = 48.9º

Answer 2

you are really saving my day @nikks1992

Answer 3

Happy to help..:)