In parallax method for the determination of focal length of a concave mirror, the object should always be placed :
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In parallax method for the determination of focal length of a concave mirror, the object should always be placed :

G1 Physics · Accepted Answer

In the parallax method, the image formed by the concave mirror must be a real image so that it can be located by removing parallax with a reference pin or screen. A concave mirror forms a real image when the object is placed beyond the focus F. Therefore the object may be placed at any point beyond F. Correct option: B.