A parallel beam of monochromatic light off wavelength `lamda=5xx10^(-7)m` is incident normally on a single narrow slit of width `10^(-3)`mm. what is angle of diffraction, the first minimum if formed?

Options

A. `30^(@)`
B. `45^(@)`
C. `60^(@)`
D. `75^(@)`

Answer

A

Explanation

`sintheta=(lamda)/(2)=(5xx10^(-7))/(10^(-3)xx10^(-3))=0.5`
`therefore theta=30^(@)`.