A liquid of refractive index 1.5 is poured into a cylindrical jar of radius 20 cm upto a height of 20 cm.A small bulb is lighted at he centre of the bottom of the jar.Find the area of the liqud surface throug which the light of the bulb passes into air.

A toy isin the form of a cone of radius 3.5 cm mounted on a hemisphere of same radius. The total height of the toy is 15.5 cm. Find the total surface area of the toy.

A toy is in the form of a cone mounted on a hemisphere of radius 3.5 cm. The total height of the toy is 15.5 cm. Find the surface area of the toy

A rectangular glass block of thickness 10 cm and refractive index 1.5 is placed over a small coin.A beaker is filled with water of refractive index 4//3 to a height of 10 cm and is placed over a small block. Find the apparent position of jthe object,when it is viewed at normal incidence. .

A toy is in the shape of a right circular cylinder with a hemisphere on one end and a cone on other. The radius and height of the cylindrical part are5cm and13cm respectively. The radii of hemisphere and conical parts are the same as that of the cylindrical part. Find the surface area of the toy if the total height of the conical part is12cm.

A point object is placed at the centre of a glass sphere of radius 6 cm and refractive index 1.5.The distance of the virtual image from the surface of the sphere is

the radius of curvature of convex surface is 10 cm and if an object lies at a distance of 20 cm from it in the rarer medium,find the position of the image assuming that refractive index of the rarer medium is 1.0 ,while that of the denser medium is 2.0.

A rectangular glass block of thickness 10 cm and refractive index 1.5 is placed over a small coin.A beaker is filled with water of refractive index 4//3 to a height of 10 cm and is placed over a small block. If the eye is slowly moved away from the normal at a certain position,the coin is found to diappear due to total internal reflection.At what surface does it happen and why? .

Glass of refractive index 1.5 is coated with a thin layer of thickness t and refractive index 1.8 . Light of wavelength lambda travelling in air is incident normally on the layer. It is partly reflected at the upper and the lower surfaces of the layer and the two reflected rays interface . If lambda = 648 nm , obtain the least value of t ("in" 10^(-8)m ) which the rays interface constructively.

A conical vessel whose internal radius is 5 cm and height of 24 cm is full of water. The water is emptied into a cylindrical vessel with internal radius 10 cm. Find the height to which the liquid rises.