A jar of height h is filled with a transparent liquid of refractive index `mu` as shown in Fig.6.05.

At the centre of the jar on the bottom surface is a dot.Find the minimum diameter of a disc,such that when placed on the top surface symmetrically about the centre,the dot is invisible.

A jar of height h is filled with a transparent liquid of refractive index mu (Fig. EP 9.26). At the centre of the jar on the bottom surface is a dot. Find the minimum diamter of a disc, such that when placed on the top surface symmetrically about the centre, the dot is invisible.

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 circular disc of radius R is placed co-axically and horizontally inside an opaque hemishperical bowl of radius a as shown in Fig.6.02. . The far edge of the disc is just visible,when viewed from the edge of the bowl.The bols is filled with transparent liquid of refractive index mu and the near edge of the disc becomes just visible.How far below the top of the bowl is the disc placed?

A spherical surface radius of curvatue R seprates air (refractive index 1.0) from glass 9refractive index 1.5).The centre of curvature is in the glass.A point object P is placed in air is found to have a real image Q in the glass.The line PQ cuts the surface at a point O and PO = OQ[Fig.2.47].Find the distance of object from the shperical surface. .

An observer can see through a pin-hole the top end of a thin rod of height h, placed as shown in the figure. The height of beaker is 3h and its radius is h. When the beaker is filled with a liquid up to a height 2h, he can see the lower end of the rod. Then the refractive index of the liquid is .

Fig.2.49 shows a solid glass sphere of radius 5 cm that has a small air bubble O trapped at a distance 2 cm from the centre C.Th refractive index of the material of glass is 1.5.Find the apparent position of the bubble where it will appear ,when seen throught the surface from an ougtside point E. .