Question

Assertion :A ray passing through centre of a curvature of a concave mirror after reflection is reflected back along the same path
Reason: The incident ray falls on the mirror along the normal to the reflecting surface
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Answer 1

Answer:

Both A and R are true and R is not the correct explanation of A

Explanation:

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Answer 2

Both assertion and reason is true and reason is correct explanation of assertion.

Explanation:

Concave mirror is a spherical mirror whose outward surface is painted. Inner surface of the sphere aperture acts as the reflecting surface. It is a converging mirror.

• Light incident on the mirror, gets converged on a point and image is formed.
• Focus is a point on principal axis where rays parallel to principal axis and coming from infinity converge.
• Focal length of spherical mirror is half of the radius of curvature.
• Radius of curvature is the radius of the sphere from which the aperture of mirror has been cut out.
• Radius of any circle passes through the centre of the circle and is perpendicular to any point on the aperture.
• When a ray of light passes through Radius of curvature, it falls perpendicular i.e. along the normal to the point on aperture.

This causes the incident ray to make an angle of $0^{o}$ with the normal and so the reflected ray also makes $0^{o}$ with the normal and the ray traces itself back along the same path.