A point source of light is placed
60 cm away from screen. Intensity detected at
point P is
I. Now a diverging lens of focal length
20 cm is placed
20 cm away from
S between
S and
P. The lens transmits
75% of light incident on it. Find the new value of intensity at
P.![127736_77cdf08b99364071a4f1c2b0506fad83.jpg](https://search-static.byjusweb.com/question-images/toppr_ext/questions/127736_77cdf08b99364071a4f1c2b0506fad83.jpg)