Ray Optics and ...

The dispersive powers of flint glass and crown glass are $$0.053$$  and $$0.034 $$and respectively and their mean refractive indices are $$1.68 $$ and $$1.53$$for white light. Calculate the angle of the flint prism required to form an achromatic combination with a crown glass of refracting angle $$4^0$$

Find the relation between critical angle "C" of a glass prism and its Angle of Prism "A", such that all the rays will reflect back while hitting second surface of prism

If the tube length of astronomical telescope is $$96$$cm and magnifying power is $$15$$ for normal setting, then the focal length of the objective is _________cm.

In a hologram, image is stored in the form of 

A Point source of Light is placed $$4 \ m$$ below the surface of water of refractive index $$\dfrac{5}{3}$$. the minimum diameter of a disc which should be placed over the source on the surface of water to cut-off all light coming out of water is: (μ=5/3) 

Calculate the refractive index of glass with respect to water. It is given that refractive indices of glass and water with respect to air are $$\dfrac {3}{2}$$ and $$\dfrac {4}{3}$$ respectively.

A ray of light is incident on the surface of transparent medium at an angle of $$45^o$$ and is refracted in the medium at an angle of $$30^o$$. What will be the velocity of light in the transparent medium ? 

Four rays, 1, 2, 3 and 4 are incident normally on the face PQ of an isosceles prism PQR with apex angles $$\angle Q = 120^{\circ}$$. The refractive indices of the material of the prism for the above rays 1,2, 3 and 4 are 1.85, 1.96, 2.05 and 2.15, respectively and the surrounding medium is air. Then the rays emerging from the face QR are :

One can not see through fog because:

In $$n$$ simillar thin prisms of same material and refractive index are arranged in series as shown :