A convex lens of focal length 40cm and a concave lens of focal length 50cm are placed in contact with each other . calculate (i) the power of the combination and (ii) focal length of the combination.
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1/f = 1/f¹+1/f²
=1/f=1/40+1/50
1/f=-10/2000
f=-1/200cm=-1/2m
p=1/f=-2/1=-2D
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