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Pole of a mirror

The imaginary...

Question

The imaginary line passing through the pole and the center of curvature of the curved mirror is called its _______.

A

Focal length

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B

Radius of curvature

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C

Principal axis

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D

None

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Solution

The correct option is D Principal axis
The imaginary line passing through the pole and the center of curvature of the curved mirror is called its principal axis.

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The imaginary line passing through centre of curvatures of the curved surfaces of a lens is called principal focus.

Q. The line joining the centre of curvature and the pole of a spherical mirror is known as the principal axis.

Q. The line joining the pole and the centre of curvature of a mirror is called the :

Q. In the case of a mirror, match the items in column A with those in column B.
A B
1. Centre of curvature (a) centre of the mirror
2. Focus (b) centre of the sphere of which the mirror is a part
3. Radius of curvature (c) point through which all the incident rays parallel to principal axis pass after reflection
4. Principal axis (d) line joining the pole and focus
5. Pole (e) distance between pole and centre of curvature

For an incident ray directed towards centre of curvature of a spherical mirror, the reflected ray :

(a) retraces its path

(b) passes through the focus

(c) passes through the pole

(d) becomes parallel to the principal axis.

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