Figure2.25 shows a cone of radius R and height H with perfectly reflecting lateral surface, is placed in the path of a light beam of intensity I. Find the force exerted on this cone.

There is a parallel beam of light of larger aperture . Let I be the intensity of light . Perfectly reflecting sphere of radius r is kept in the path of this parallel beam . Find the force exerted by the light beam on sphere .

A perfectly reflecting solid hemisphere of radius R is placed in the path of a parallel beam of light of large aperture. If the beam carrries an intensity l, find the force exerted by the beam on the hemisphere.

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

In the path of a uniform light beam of large cross-sectional area and intensity I. a solid sphere of redius R which is perfectly reflecting is placed . Find the force exerted on this sphere due to the light beam.

The cone of radius R and height H is hanging inside a liquid of density by means of a string a shwon in the figure.

A sphere of radius r has the same volume as that of a cone with a circular base of radius r. Find the height of the cone.

A solid sphere of radius r is melted and recast into the shape of a solid cone of height r. Find radius of the base of the cone.

A beam of white light is incident normally on a plane surface absorbing 70% of the light and reflecting the rest. If the incident beam of light is power P, find the force exerted by it on the surface.