[" 21.A large glass slab "(mu=(5)/(3))" of thickness "8cm" is placcd over a point source of lizht on a plane surface."],[" It is seen that light emerges out of the top surface of the slab from a cricular area of radius "Rcm" ."],[" Find the value of "R" ? "]

A large glass slab (mu=5//3) of thickness 8cm is placed over a point source of light on a plane surface. It is seen that light emerges out of the top surface of the slab from a circular area of radius R cm. What is the value of R?

A large glass slabe (mu=5//3) of thickness 8cm is placed over a point source of light on a plane surface. It is seen that light emerges out of th etop surface fo the slab from a circular area of radius R cm. What is the value of R?

A glass slab of thickness 12 cm is placed on a table. The level surface of the slab has a black spot. At what depth from the upper surface will the spot appear when viewed from above? (Refractive index of glass = 1.5)

A glass slab of thickness 12 cm is placed on a table. The level surface of the slab has a black spot. At what depth from the upper surface will the spot appear when viewed from above? (Refractive index of glass = 1.5)

Light from a point source in air falls on a spherical glass surface (n = 1.5) of radius of curvature 20 cm. The distance of the light source form the glass surface is 100 cm. Find the position of the image.

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 flat glass slab of thickness 6 cm and index 1.5 is placed in front of a plane mirror. An observer is standing behind the glass slab and looking at the mirror. The actual distance of the observer from the mirror is 50 cm. The distance of his image from himself, as seen by the observer is

A flat glass slab of thickness 6 cm and index 1.5 is placed in front of a plane mirror. An observer is standing behind the glass slab and looking at the mirror. The actual distance of the observer from the mirror is 50 cm. The distance of his image from himself, as seen by the observer is