The bulb used in a torchlight is placed at a distance 'x ' from the mirror used. The value of 'x ' is :- a) f/2 b) f c) f/3 d) 3f
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(A)f/2 is the answer
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the object is at f becuse of object is placed at f the raus will meet at infinity which is usefull in torch
varunrocker67:
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