Given λ = 5000 Å = 5 × 10-7 m
The wavelength and frequency of reflected light remains same.
∴ Wavelength of reflected light,
λ = 5000 Å.
Frequency of reflected light,
v = \(\frac{c}{λ}\) = \(\frac{3\times10^8}{5\times10^{-7}}\)
= 6 × 1014 HZ
The reflected ray is normal to incident if angle of incidence i = 45°.