Important Terms Related to Spherical Mirror

Q.

Define the terms pole, principal axis and centre of curvature with reference to a spherical mirror.

Q.

Where does the centre of curvature lie:-

1. I & III

2. IV only

3. II & III

4. II and III

Q.

Define Principal axis

Q.

When a concave mirror is used as a shaving mirror, where is the person’s face in relation to the focus of the mirror?

1. Between the centre of curvature and focus

2. Beyond the centre of curvature

3. At focus

4. Between pole and focus

Q.

Label the parts of the diagram.

1. A – centre of curvature; b – focus; C – pole; D – radius of curvature

2. A – focus; b – centre of curvature; C – principal axis; D – pole

3. A – pole; b –focus; C – centre of curvature; D – principal axis

4. A – principal axis; b – pole; C – radius of curvature; D – focus

Q. The line joining the centre of curvature and the ___ of the mirror is called the principal axis

1. pole
2. focus
3. radius
4. point of incidence

Q.

A spherical concave mirror focuses all rays parallel to its principal axis exactly onto the focus. True or False?

1. True

2. False

Q.

What is focal length of a plane mirror?

1. f = 1

2. focal length is infinity

3. cannot be said

4. f = 0

Q. Define the Principal Focus of a Concave Mirror? [1 mark]