two lens 1&2 are placed in contact . focal length of lens 1 is 20cm and 2 is 10cm .calculate : a)total power of combination b)what is the nature of combination
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Answer:here
F1= 20*10^-2 m
F2= 10*10^-2m
Then
For total power after the combination,
1/F = 1/F1 + 1/ F2
P= 15 dioptres
Nature of combination:: since the power obtained is positive , the image formed is real
Explanation:
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