Three students A, B and C focussed a dis...

Three students A, B and C focussed a distant building on a screen with 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 :

A

Only A

B

Only B

C

A and B

D

B and C

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