Snell’s law is stated as:

Focal length for concave mirror is :

An object of placed at he centre of curvature of a concave mirror. The image produced by the mirror is located:

An object is 14 cm is front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirror?

Which of the following is not processing:

The critical angle for a beam of light passing from water into air is 48.8 degrees. This mean that all light rays with an angle of incidence greater than this angle will be:

A device which has two ways communication is:

For a normal person audible frequency range for sound wave lies between:

Snell’ law is:

Hard disk is made of:

Which form of energy is sound:

The ray of the light after reflection from concave mirror passes through:

Plank suggested that light consists of small packets of energy called:

The angle between incident ray and normal N is;

Angle of incidence is represented by

Regular reflection is reflection by the

The line passing through the two centres of curvatures of the lens is called

Optical centre is represented by

For a concave lens, the parallel rays appear to come from a. point behind the lens is called;

In lens number ·of curved surfaces at least;

Lenses are used in optical devices;

A magnifying glass is a convex Jens which is used to produce magnified images of small objects. It is also called;

It is an. optical instrument which is used “to observe distant objects using lens or mirror;

Human eye acts like;

Light enters the eye through transparent membrane called;