A convex mirror is used to reflect light from an object placed 30 cm in front of the mirror. If the focal length of the mirror is 20 cm then the location of the image should be

One of the angle of a right-angled prism is

Light enters the eye through a transparent membrane known as

The reflection by the rough surfaces is called

The lens which is thin at center and thick at edges is

The nature of light is wave as well as particle, thus its nature is

The quantity which does not changes during refraction is

To describe the change in speed of light in a medium, the term used is called index of

In human eye, the image is formed

The power of lens is

When a ray of light enters from denser medium to rare medium it bends

For a diverging lens the focal length is

If the object is towards the right side of the lens, the object distance will be

The power of magnifying glasses given by

In astronomical compare to eye piece, objective lens has

The inability of eye to see the objects clearly is called

The size of the image is always smaller than the object in

Find the focal length of the mirror that forms an image 6.2 cm behind the mirror of an object placed at 26 cm in front of the mirror?

The lens with a long focal length is

The variation of focal length to form a sharp image on retina is called

In concave mirror, the size of image depends upon

When light travelling in a certain medium falls on the surface of another medium, a part of it turns back in the same medium. This phenomenon is called