After cataract operation, a person is recommended with concave - convex, spectacles of curvatures 10 cms and 50 cm. Crown glass of refractive indices (1.51) for red and (1.53) for violet colours is used for this. Calculate the lateral chromatic aberration occurring due to these glasses.

After cataract operation, a peisun is recommended with concavo-convex spectacles of curvatures 8 cm and 40 cm. Crown glass of refractive indices 1.51 for red and 1.53 for violet colours is used for this. The lateral chromatic aberration occuring due to these glasses is

Refractive index of a flint glass varier from 1.60 to 1.66 for visible range. Radii of curvature of a thin convex lens are 10 cm and 15 cm. Calculate the chromatic aberration between extreme colours.

A double convex thin lens made of glass (refractive index mu = 1.5 ) has both radii of curvature of magnitude 20 cm . Incident light rays parallel to the axis of the lens will converge at a distance L such that

Two plano-concave lenses (1 and 2) of glass of refractive index 1.5 have radii of curvature 20 cm and 10 cm. They are placed in contact with their curved surface towards each other and the space between them is filled with liquid of refractive index 4/3. Then the combination is

An aquarium is filled with water. The lateral wall of the aquarium is 50 cm long and 40 cm high. Using 10 g//cm^(2) for the acceleration due to gravity, and 1 g//cm^(2) for the density of water, the force on the lateral wall of the aqurium is

A convex lens is put 10 cm from a light source and it makes a sharp image on a screen, kept 10 cm from the lens. Now a glass block (refractive index 1.5) of 1.5 cm thickness is placed in contact with the light source. To get the sharp image again, the screen is shifted by a distance d. Then d is

The convex surface of a thin concavo-convex lens of glass of refractive index 1.5 has radius of curvature 10 cm. The concave surface has a radius of curvature 30 cm. The convex side is silvered and placed on a horizontal surface. Then where should a pin be placed on the optic axis such that its image is formed at the same place?