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OTP to be sent to Change
u1 = 20cm
f1 = 15cm
therefore 1/v1 = 1/u1 + 1/f1
1/v1 = 1/20 + 1/15
1/v1 = 7/60
v1 = 60/7
now object is shifted
two cases arise 1)- object moved away from second lens 2)- object is moved towards the lens
v2 = 60/7
u2 = 35 , 25
therefore the two possible focal lenghts will come out as 420/37cm and 300/23cm respectively.
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