Spherical Mirrors

When a spherical mirror is held up almost facing the sun, a sharp image of the sun is formed on a small piece of paper, which causes it to catch fire. The spherical mirror is _____ in nature and the sheet of paper is placed at the _____ of the mirror. Fill in the blanks by choosing an appropriate option from the ones given below.

What is focus in a spherical mirror?

What happens when a ray of light is incident at the pole?

Which ray striking a spherical mirror will be reflected along itself?

What happens if aperture is increased in spherical mirror?

What is the aperture of a spherical mirror?

Which type of mirror has a virtual focus?

Explain the meaning of the term focus of a convex mirror, with the help of a suitable ray diagram. 

Explain the relation between the radius of curvature and the focal length of concave mirror and convex mirror.

The radius of curvature is equal to twice the focal length of concave mirror.

The radius of curvature is equal to twice the focal length of convex mirror.

The radius of curvature is equal to twice the focal length of convex mirror. Explain.

The radius of curvature is equal to twice the focal length of concave mirror. Explain.

Focus is real in the case of-

A ray parallel to the principal axis,after reflection,will pass through the principal focus.

Name the point where all the incident rays coming parallel to the principal axis meet after reflection from a concave mirror.
(Center of curvature/ focus).

Rajeev obtained the image of a distant object on a screen by using a concave mirror. Then, the distance between mirror and screen gives

The focal length of a spherical mirror changes when it is completely immersed in the water.

Draw the ray diagram necessary for a concave mirror to represent the image formed by the mirror of an object placed between the pole and the focus.

The power of a lens is $+2 \mathrm{Dioptre}$. What is the focal length of this lens?