A laser beam has a wavelength of `7 xx 10^(-7) m` and aperure `10^(-2)m`. The beam is sent to moon at a distance of `4 xx 10^(5) km` from earth. Find the angular spread and areal spread of the beam on reaching the moon.

A laser beam having lamda=7000 Å and aperture d=10^(-2)m is sent to the moon. What is the angular spread of the beam?

The moon is 4xx10^(8)m from the earth. A radar signal transmitted from the earth will reach the moon in about

A laser operates at a frequency of 3xx10^(14) Hz and has an aperture of 10^(-2) m. What will be the angular spread ?

A parallel beam of light of wavelength 4000 Å passes through a slit of width 5 xx 10^(-3) m . The angular spread of the central maxima in the diffraction pattern is

A parallel beam of light of wavelength 4000 Å passes through a slit of width 5 xx 10^(-3) m . The angular spread of the central maxima in the diffraction pattern is

A laser beam of 7,500 Å is sent from a lunar rover on the moon. If laser beam passes through an aperture of 0.8 cm, calculate the angular spread of diffracted beam on reaching the Earth. The distance between the Earth and the moon is 4 xx 10^5 km .