Question

two convex lenses of power 5 diopter and 2 diopter are placed in contact with a concave lens of power 1 diopter calculate the focal length of combination and state the nature of the combination of these lenses​

Answer 1

Answer:

P1=f11=+10D

P2=f21=−5D

M=2

The focal length of the combination,

f1=f21+f21

f1=10−5=+5D

f=5100=20cm

For virtual image, M=uv

v=2u

From lens formula

f1=v1−u1

201=2u1−u1

201=−

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