The focal length of a small concave mirror is 2.1 cm. In order to use this concave mirror as a dentist’s mirror, the distance of tooth from the mirror should be :

A diverging mirror is a

The magnification produced by a concave mirror is  \(-\frac{4}{7}\).

Which one of the following is a correct statement about the image formed by the mirror.

A communications satellite in orbit sends a parallel beam of signals down to earth. If these signals obey the same laws of reflection as light and are to be focused onto a small receiving aerial, what should be the best shape of the metal ‘dish’ used to collect them ?

The magnification produced by a plane mirror is +1. The nature and relative size of the image is:

Identify the incorrect statement.

One of the following does not apply to a concave mirror. This is :

An object is placed at the following distances from a concave mirror of focal length 10 cm : 

    (a) 8 cm           (b) 15 cm        (c) 20 cm         (d) 25 cm 

Which position of the object will produce a diminished image ?

When a spherical mirror is held towards the sun and its sharp image is formed on a piece of carbon paper for some time, a hole is burnt in the carbon paper.

At which point of the spherical mirror the carbon paper is placed ?

What is the nature of the spherical mirror?

In order to obtain a magnification of –1.5 with a concave mirror of focal length 12 cm, the object will have to be placed at a distance :