A plate of mass 10g is in equilibrium in air due to the force exerted by a light beam on the plate. Calculate power of the beam. Assume that the plate is perfectly absorbing.

A plate of mass 10 gm is in equillibrium in air due to the force exterted by light beam on plate. Calculate powder of beam. Assume plates is perfectly absorbing.

A plate of mass 10 gm is in equillibrium in air due to the force exterted by light beam on plate. Calculate powder of beam. Assume plates is perfectly absorbing.

What is the force exerted by a Light Beam On a Surface ?

Force Exerted By A Light Beam On A Surface

A parallel beam of monochromatic light of frequency v is incident on a surface. Intensity of the beam is I and area of the surface is A. Find the force exerted by the light beam on the surface for following cases– (i) the surface is perfectly absorbing and the light beam is incident normally on it. (ii) the surface is perfectly reflecting and the light beam is incident normally. (iii) the surface is perfectly absorbing and the light beam is incident at an angle of incidence theta . (iv) the surface is perfectly reflecting and the light beam is incident at an angle of incidence theta .

A narrow beam of monochromatic light of wavelength lamda emitted from a source of power P is propogating in the positive x-direction. After being reflected from a perfectly reflecting plane mirror of area vector vecA=A(-hati-hatj) , the beam falls on a metal plate of surface area A[ vecA is along outward normal at mirror]. the force exerted by light beam on the mirror is vecF and Deltavecp is change in momentum of each photon then [cis speed of light in vacuum]