JAMB - Physics (1992 - No. 26)
If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?
30o
42o
45o
50o
คำอธิบาย
sin c = \(\frac{1}{n}\) = \(\frac{1}{2}\)
c = sin-1\((\frac{1}{n})\)
= 30o
c = sin-1\((\frac{1}{n})\)
= 30o