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Light of wavelength 5000 Å falls on a reflecting surface. What are the wavelength and frequency of the reflected light? For what angle of incidence is the reflected ray normal to the incident ray?

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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°.

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