Light of wavelength `5000Å` falls on a plane 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?

Explanation

`lamda=5xx10^(-7)m, c=3xx10^(8)ms^(-1)`
`:.` Frequencey `v=c/(lamda)=(3xx10^(8))/(5xx10^(-7))=6xx10^(14)Hz`
`i=r,i+r=90^(@):.2i=90^(@), i=45^(@)`