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Solution


Q.

Three students A, B and C focussed a distant building on a screen with the help of a concave mirror. To determine focal length of the concave mirror they measured the distances as given below :
Student A : From mirror to the screen
Student B : From building to the screen
Student C : From building to the mirror

Who measured the focal length correctly

1 Only A  
2 Only B  
3 A and B  
4 B and C  

Ans.

(1)

A concave mirror always forms the image of a distant object at its focus.