JAMB - Physics (1986 - No. 22)
If the refractive index of glass is 1.5, what is the critical angle at the air-glass interface?
sin-1\(\frac{1}{2}\)
sin-1\(\frac{2}{3}\)
sin-1\(\frac{3}{4}\)
sin-1\(\frac{8}{9}\)
คำอธิบาย
sin ic \(\frac{1}{n}\) = \(\frac{1}{1 - 5}\)
i = sin-1\(\frac{1}{1 - 5}\)
= sin-1\(\frac{10}{15}\)
= sin-1\(\frac{2}{3}\)
i = sin-1\(\frac{1}{1 - 5}\)
= sin-1\(\frac{10}{15}\)
= sin-1\(\frac{2}{3}\)