1) A point source of light is placed at the centre of curvature of a hemispherical surface.the radius if curvature is r and the inner surface is completely reflecting.Find the force on the hemisphere due to the light falling on it if the source emits a power W?
2)A perfectly reflecting solid sphere of radius r is kept in the path of a parallel beam of light of large aperture.If the beam carries an intensity I,find the force exerted by the beam on the sphere???
1) A point source of light is placed at the centre of curvature of a hemispherical surface.the radius if curvature is r and the inner surface is completely reflecting.Find the force on the hemisphere due to the light falling on it if the source emits a power W?
2)A perfectly reflecting solid sphere of radius r is kept in the path of a parallel beam of light of large aperture.If the beam carries an intensity I,find the force exerted by the beam on the sphere???