Published by:
CGP EDU Academic Team
Published on: August 13, 2026
In parallax method for the determination of focal length of a concave mirror, the object should always be placed :
A
between the focus (F) and the centre of curvature
B
at any point beyond the focus 
of the mirror
of the mirror C
of the mirror ONLY
beyond the centre of the curvature of the mirror ONLY
beyond the centre of the curvature of the mirror ONLY
D
between the pole (P) and the focus (F) of the concave mirror ONLY
Text Solution
Verified by ExpertsThe correct answer is:
B
Image should be real. So object should be placed beyond focus.
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