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Question

A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of he combination, is :
  1. +6.67D
  2. 6.5D
  3. 1.5D
  4. +6.5D

A
1.5D
B
+6.5D
C
6.5D
D
+6.67D
Solution
Verified by Toppr

Given,

f1=+40cm

f2=25cm

Power, P=1f

The power of combination,

P=1f1+1f2

P=100+40cm+10025cm

P=1.5D

The correct option is C.

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