Embibe Experts Solutions for Chapter: Refraction, Dispersion and Lens, Exercise 1: Odisha Board-2018

In an optical fibre, the propagation of light occurs due to which phenomenon? Write answer only.

Use the lens equation and prove that for a convex lens when the object is placed within the focal length, the image will be virtual.

A biconvex lens is to be made from glass of refractive index $1.55$, with both faces having the same radius of curvature. Determine this radius of curvature if the focal length is $20 \mathrm{cm}$.

Two thin lenses are in contact with each other. One of these is a concave lens of focal length $20 \mathrm{cm}$ and the other is a convex lens of the same focal length. Determine the focal length of the combination and state how it behaves.

Monochromatic light of wavelength $600 \mathrm{nm}$ enters from air into a glass medium of refractive index $1.5$. The wavelength of refracted light inside the glass is

The refractive index of diamond is $2.419$. Calculate the critical angle for light going from diamond to air.

A biconvex lens is to be made from glass of refractive index $1.5$ with both faces having same radius of curvature. Determine the focal length if this radius of curvature is $30 \mathrm{cm}$.