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a tube pf length 30cm has its inner lateral surface blackened.two lenses of focal lengths 10 and 20 cm are fixed at ends of tube, for same beam intensities of spot on screen are I1 and I2 for arrangement when beam is focussed on 10cm side and I2 for other case then I1/I2 equals? 1 16 1/16 0.25

  a tube pf length 30cm has its inner lateral surface blackened.two lenses of focal lengths 10 and 20 cm are fixed at ends of tube, for same beam intensities of spot on screen are I1 and I2 for arrangement when beam is focussed on 10cm side and I2 for other case then I1/I2 equals?


1


16


1/16


0.25


 

Grade:12

2 Answers

SAGAR SINGH - IIT DELHI
879 Points
10 years ago

Dear student,

The correct ans is 1/16 ie c)

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Sagar Singh

B.Tech, IIT Delhi

Saurabh Max
15 Points
10 years ago

pls explain me how.....

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