Refraction

Show that for a material with refractive index `µ ≥ sqrt(2)`, light incident at any angle shall be guided along a length perpendicular to the incident face.

When a ray of light is refracted from one medium to another, then the wavelength changes from 6000Å to 4000Å. The critical angle for the interface will be ______.

Write a short note on the prisms making use of total internal reflection.

A ray of light passes through equilateral prism such that the angle of incidence is equal to angle of emergence and each of these angles is equal to `(3/4)^"th"` the angle of prism. The angle of deviation is ______.

What is looming?

Double-convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of the same radius of curvature. What is the radius of curvature required if the focal length is to be 20 cm?

An object P is focussed by a microscope M. A glass slab of thickness 2.1 cm is introduced between P and M. If the refractive index of the slab is 1.5, by what distance should the microscope be shifted to focus the object again?

Light travels in two media A and B with speeds 1.8 × 10⁸ ms⁻¹ and 2.4 × 10⁸ ms⁻¹ respectively. Then the critical angle between them is: