To determine the focal length of a concave mirror, a student focuses a distant object using the concave mirror. The best object can be: (a) Sun (b) A distant tree (c) Classroom window (d) All of these For XIII class CBSE.

Answers (1)

When parallel rays of light from infinity fall on concave mirror, they converges at principal focus of mirror. Hence, to determine focal length of concave mirror, the most distant object should be focused. As we know sun is most far away it'll the best object for accurate determination of focal length.
 

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