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Solution


Q.

In parallax method for the determination of focal length of a concave mirror, the object should always be placed:    [2026]
1 between the focus (F) and the centre of curvature (C) of the mirror ONLY  
2 at any point beyond the focus (F) of the mirror  
3 between the pole (P) and the focus (F) of the concave mirror ONLY  
4 beyond the centre of the curvature (C) of the mirror ONLY  

Ans.

(2)

Image should be real. So object should be placed beyond focus.