A small illuminated bulb is at the bottom of a tank, containing a liquid of refractive index `mu` upto a height H. Find the expression for the diameter of an opaque disc, floating symmetrically on the liquid surface in order to cut- off the light from the bulb.

In Fig. a plane mirror lies at a height h above the bottom of a beaker containingwater (refractive index mu ) upto a height f. Find the position of the image of the

A point source of light S is placed at the bottom of a vessel containg a liquid of refractive index 5//3. A person is viewing the source from above the surface. There is an opaque disc of radius 1 cm floating on the surface. The centre of the disc lies vertically above the source S. The liquid from the vessel is gradually drained out through a tap. What is the maximum height of the liquid for which the source cannot at all be seen from above?

A point source of light S is placed at the bottom of a vessel containing a liquid of refractive index 5//3 . A person is viewing the source from above the surface. There is an opaque disc of radius 1 cm floating on the surface. The centre of disc lies vertically above the source O . The liquid from the vessel is gradually drained out through a tap. What is the maximum height of the liquid for which the source cannot be seen at all.

A concave mirror of radius of curvature h is placed at the bottom of a tank containing a liquid of refractive index mu upto a depth d. An object P is placed at height h above the bottom of the miror. Outside the liquid, an observer O views the object and its image in the mirror. The apparent distance between these two will be

A concave mirror of radius of curvature h is placed at the bottom of a tank containing a liquid of refractive index mu upto a depth d. An object P is placed at height h above the bottom of the miror. Outside the liquid, an observer O views the object and its image in the mirror. The apparent distance between these two will be

A plane mirror is placed at the bottom of a tank containing a liquid of refractive index mu . P is a small object at a height h above the mirror. An observes P and its image in the mirror. The apparent distance between two will be

A plane mirror is placed at the bottom of the tank containing a liquid of refractive index mu . P is a small object at a height h above the mirror. An observer O vertically above P, outside the liquid sees P and its image in the mirror. The apparent distance between these two will be

A plane mirror is placed at the bottom of a tank containing a liquid of refractive index mu . P is a small object at a height h above the mirror. An observer observes P and its image in the mirror. The apparent distance between two will be