A convex lens is in contact with concave lens of focal length 30cm and 40cm respectively find the total combination of focla length
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1/f = 1/f1 +1/f2
1/f = 1/30 +1/40
= 7/120
f= 17.1 cm
1/f = 1/30 +1/40
= 7/120
f= 17.1 cm
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