Q3 of 84 Page 324

A perfecting reflecting mirror has an area of 1cm2. Light energy is allowed to fall on it for an hour at the rate of 10 Wcm-2. The force that acts on the mirror is

Given: -


Area of the mirror = 1 cm2,


Power transmitted to the mirror = 10 Wcm-2,


Calculations: -


The average force is given by ,


Since the surface is perfectly reflecting we can write


So




6.7×10-8 N

More from this chapter

All 84 →
1

A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature 36 cm. The distance of the object from the mirror is 

 2

A convex mirror of focal length f forms an image of the size of the object. The distance of the object from the mirror is

 4

An object is placed at the centre of curvature of a concave mirror. The distance between its image and the pole is

 5

The refractive index of lens flint glass is 1.65 and for alcohol, it is 1.36 with respect to air, then the refractive index of the dens flint glass with respect to alcohol is