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Time required for making a print at a di...

Time required for making a print at a distance of 40 cm from a 60 watt lamp is 12.8 second. It the distance is decreased to 25 cm, then time required in making the similar print will be :

A

15 sec

B

10sec

C

5sec

D

Remains some

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PHYSICS GALAXY - ASHISH ARORA-GEOMETRICAL OPTICS-Numerical MCQs Single Options Correct
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