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Rays parallel...

Question

Rays parallel to the principal axis of a concave mirror meet at which point?

A

Centre of curvature

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B

Pole

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C

Focus

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D

At a point in the middle of the centre of curvature and focus

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Solution

The correct option is C
Focus

Rays parallel to principal axis converge and meet at the focus.
Note: $P A = \frac{1}{2} P B$ . The principal focus is a point on the principal axis of a mirror where the beam of light meets after reflection.

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Similar questions

Q. Where will the image form when we place an object, on the principal axis of a concave mirror at a point between focus and centre of curvature?

The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?

(a) Between the principal focus and the centre of curvature

(b) At the centre of curvature

(c) Beyond the centre of curvature

(d) Between the pole of the mirror and its principal focus.

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

Q. Question 2
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?

(a) Between the principal focus and the centre of curvature
(b) At the centre of curvature
(c) Beyond the centre of curvature
(d) Between the pole of the mirror and its principal focus

Q. A ray of light is incident on a concave mirror. It is parallel to the principal axis and its height from principal axis is equal to the focal length of the mirror. The ratio is the distance of point B to the distance of the focus from the centre of curvature is :

(AB is the reflected ray).

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