Question

A ray of light is incident on a glass slab at an angle of 450 if refractive index of glass is 1.6 what is the angle of reflection

Answer 1

$\frac{ \sin(i) }{ \sin(r) } = \frac{u}{v } \\ \frac{ \sin(45) }{ \sin(r) } = 1.6 \\ \sin(r) = \frac{1}{1.6 \sqrt{2} } \\ r = \sin {}^{ - 1} ( \frac{1}{1.6 \sqrt{2} } ) \\ r = {26}^{o} \: (approx.)$
u = refractive index of glass
v = refractive index of air