Physics

What happens to the speed of light when it enters glass from air?

The SI unit of refractive index is:

A person suffering from Hypermetropia uses which type of lens?

The band of seven colors obtained by dispersion of white light is:

Which phenomenon is responsible for the blue color of the sky?

What type of image is formed on a cinema screen?

The point on the principal axis where all rays parallel to the principal axis meet after reflection is:

The color of light with the longest wavelength is:

An object is placed 10 cm in front of a plane mirror. The distance between the object and its image is:

Twinkling of stars is due to:

Which mirror can form both real and virtual images?

If the refractive index of water is 1.33 and glass is 1.5, in which medium does light travel faster?

Calculate the focal length of a lens with power +2.0 D.

An object is placed at the center of curvature (C) of a concave mirror. The magnification produced is:

A ray of light enters a glass slab perpendicularly (at 90 degrees to the surface). The angle of refraction is:

The critical angle for a medium is 45 degrees. What is its refractive index?

For a convex lens, where should an object be placed to get a virtual and magnified image?

Total Internal Reflection occurs when light travels from:

What is the relation between the radius of curvature (R) and focal length (f) of a spherical mirror?

A convex mirror always produces an image which is: