Question

absolute R.I of water is 4/3 what is critical angle? ?

Answer 1

hello !!

we know that critical angle = arcsin (1/u)

here , u = 4/3

therefore..

=) critical angle = arcsin( 3/4 ) = 37° ans

Answer 2

sinθ = 1/(R.I)
θ = arcsin (1/R.I)
θ = arcsin (3/4) = 48.5903⁰