A source of light of power P is shown in Fig. 3.6. Find the force on the block placed in the path of the light rays. The surface of body on which the light beam is incident is having a reflection coefficient `a_r=0.7` and absorption coefficient `a_a=0.3`.

A ray of light is incident on a convex mirror as shown in Fig. Redraw the above diagram after completing the path of the light ray after reflection from the mirror.

A point source of light is 80.0cm below the surface of a body of water. Find the diameter of the circle at the surface through which light emerges from the water.

A beam of monochromatic light passes through a pile of N = 5 identical plane-parallel glass plates each of thickness l = 0.50 cm . The coefficient of reflection at each surface of the plates is rho = 0.050 . The ratio of the intensity of light transmitted through the pile of plates to the intensity of incident light is tau = 0.55 Neglecting the secondary reflections of light, find the absorption coefficient of the given glass.

A ray of light through (8,3) is reflected at (14,0) on the x - axis. Find the equation of the reflected ray.

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 ray of light is incident on a prism ABC of refractive index sqrt3 as shown in Fig.3.14. Find the angle of incidence for which the deviation of light ray by the prism ABC is minimum. .

Light is falling on surface S1, S2, S3 as shown in Fig.16.1. Surfaces on which the angle of incidence is equal to the angle of reflection is/are

If the absorption coefficient and reflection coefficient of a surface of a body are 0.4 and 0.6 respectively then:-

If the absorption coefficient and reflection coefficient of a surface of a body are 0.4 and 0.6 respectively then:-