A laser beam can be focussed on an area equal to the square of its wavelength `A` `He-Ne` laser radiates energy at the rate of focussed beam will be

A laser beam can be focussed on an area equal to the square of its wavelength. A He-Ne laser radiates energy at the rate of 1mW and its wavelength is 600 nm . The intensity of focussed beam will be

The laser beam can be used to measure large distances because it is :

Photons in a laser beam have the same energy, wavelength, polarization direction, and phase because

A laser beam is operating at 100 mW. The amount of energy stored by 90 cm length of this laser beam will be

Find the energy stored in a 60 cm length of a laser beam operating at 4 m W.

Find the energy stored in a 60 cm length of a laser beam operating at 4 m W.