Optics

Refractometer is used to determine:

Which Phenomenon deals with the scattering of light by molecules of a medium when they are excited to vibrational energy levels?

Which one among the following colours has the highest wavelength?

Due to _____, the stars seem to be higher in the sky than they actually are?

The sky looks blue because of _____.

The speed of light with the rise in the temperature of the medium: 

Optical fibre works on the principle of -

What is the nature of the image formed due to the concave mirror when an object is placed between the centre of the curvature?

An image formed by a plane mirror is always_____.

An object $5 \mathrm{cm}$ in length is placed at a distance $20 \mathrm{cm}$ in front of a convex mirror of radius of curvature $30 \mathrm{cm}$. The position of the image is at:

Ritu is standing in front of a plane mirror. The distance between Ritu and her image is $10 \mathrm{m}.$ If she moves $2 \mathrm{m}$ towards the mirror, then the distance between Ritu and her image is:

Choose the correct statement from the following for a pin-hole camera.

An ordinary tube light used for lighting purposes contains _____.

Infra-red radiations:

Which of the following is true regarding velocities of electromagnetic waves and light waves?

In a TV transmitter, the illuminated scene is televised with three TV cameras, each provided with an optical filter to transmit a particular colour. The colours used are:

The formation of brilliant colours in a thin soap film is a consequence of the phenomena of _____.

When there is depletion of Ozone in the stratosphere, the wavelength of radiation striking the earth's surface will be _____.

__ is one of the liquids commonly used in liquid-in-glass thermometers

The spectrum of light was first explained by _____.