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? |
(a) Only A |
(b) Only B |
(c) A and B |
(d) B and C |
Answer:
(a) Only A
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