Light of intensity `50W//m^(2)` is incident on a arae of `1m^(2)` in such a way that `25%` of light is reflected back. Find the force exerted by light on surface if light incident perpendicularly

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 .

If the intensity of the incident radio wave of 1 "watt"//m^2 is reflected by the surface, find the pressure exerted on the surface.

A parallel beam of light of intensity I is incident on a glass plate. 25% of light is reflected in any reflection by upper surface and 50% of light is reflected by any reflection from lower surface. Rest is refracted The ratio of maximum to minimum intensity in interference region of reflected rays is

A parallel beam of light of intensity I is incident on a glass plate. 25% of light is reflected in any reflection by upper surface and 50% of light is reflected by any reflection from lower surface. Rest is refracted The ratio of maximum to minimum intensity in interference region of reflected rays is

Light with intensity 20 W / cm^2 is falling along the normal on a surface , which completely abssorbs the light area of the surface is 25 cm^2 find the average force exerted y light on this surface in one hour .

A light beam of intensity 20 W//cm^(2) is incident normally on a perfectly reflecting surface of sides 25 cm x 15 cm. The momentum imparted to the surface by the light per second is