A straight line joining the object point and image point is always perpendicular to the mirror :

if mirror is plane only

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if mirror is concave only

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if mirror is convex only

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irrespective of the type of mirror

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Solution

The correct option is D irrespective of the type of mirror
Any line joining the object point and the image point always passes through the centre of curvature of the mirror. This, is because of the law, that any ray passing through the centre of curvature of the mirror will retrace its path back.
Thus, any ray passing through the centre of curvature will be perpendicular to the mirror irrespective of the type of the mirror used.

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Similar questions

Which of the following can be used to form a real image?

(a) Concave mirror only

(b) Plane mirror only.

(d) Both concave and convex mirrors.

Question 6

An erect and enlarged image can be formed by

(a) only a convex mirror.

(b) only a concave mirror.

(d) both convex and concave mirrors.

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