Two isosceles prism of prism angle `A` and refractive index `mu` are placed with their bases touching each other. This system can act as a crude converging lens. The focal length of the lens for `A=10^(@),mu=1.5` and a ray of light incident on a prims at a height of `1` cm from its base, is approximately.

Two identical thin isosceles prisms of refracting angle A and refractive index mu are placed with their bases touching each other and this system can collectively act as a crude converging lens. A parallel beam of light is incident on this system as shown in Figure. Find the focal length of this so called converging lens.

Two identical thin isosceles prisms of refracting angle A and refractive index mu are placed with their bases touching each other and this system can collectively act as a crude converging lens. A parallel beam of light is incident on this system as shown in Figure. Find the focal length of this so called converging lens.

Two identical thin isosceles prims of refracting angle theta and refractive index mu are placed with their bases touching each other. A parallel beam , of width 2b, is incident on this system , as shown. The distance of the point of convergence from the prism is

The focal length of the lens of refractive index (mu = 1.5) in air is 10 cm. If air is replaced by water of mu = (4)/(3) , its focal length is

A thin converging lens of refractive index 1.5 has a focal power of 5 D. When this lens is immersed in a liquid, it acts as a diverging lens of focal length 100 cm. The refractive index of the liquid is

The radii of curvature of a lens are +20cm and +30cm .The material of the lens has a refractive index 1.6 .Then focal length of the lens (in cm) if it is placed in water of refractive index mu =(4)/(3) is

A prism of refractive index mu_g deviates the incident ray towards its base. If it is immersed in a transparent liquid of refractive index mu_1 such that mu_1 gt mu_g then prism would

A prism of refractive index mu_g deviates the incident ray towards its base. If it is immersed in a transparent liquid of refractive index mu_1 such that mu_1 gt mu_g then prism would