The focal length of a concave mirror is 5cm. Its radius of curvature is

The speed of light is maximum in

Which of the following statements about total internal reflection is true?

A spherical mirror whose reflecting surface is curved outwards is called ___________ mirror

All distances parallel to the principal axis are measured from the ____________ of the mirror

Light is refracted or bent while going from one medium to another because its __________ changes

If a ray of light passes obliquely from one medium to another, it does not suffer any deviation.

An object is placed at distance of 3 cm from a plane mirror. The distance of the object and image is 3 cm.

The distance from centre of curvature of the mirror to the pole is called the focal length of the mirror.

When an object is at the centre of curvature of concave mirror the image formed will be virtual and erect.

Light travels from a rarer medium to a denser medium. The angles of incidence and refraction are respectively 45^o and 30^o. Calculate the refractive index of the second medium with respect to the first medium.
Angle of incidence i = 45^o
Angle of refraction r = 30^o

A coin in a glass beaker appears to rise as the beaker is slowly filled with water, why?

Why does a ray of light bend when it travels from one medium to another?

An object 2 cm high is placed at a distance of 16 cm from a concave mirror which produces a real image 3 cm high. Find the position of the image.

State the direction of incident ray which after reflection from a spherical mirror retraces its path. Give reason for your answer.

Write the spherical mirror formula and explain the meaning of each symbol used in it.

Find the size, nature and position of image formed when an object of size 1 cm is placed at a distance of 15 cm from a concave mirror of focal length 10 cm.