Question

4. A convex lens of focal length 25 cm is placed in contact with a concave lens of focal length 20
the focal length of the combination of lenses (ii) power of the combination. What is the nature of the
combination ?
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Answer 1

Explanation:

see the attachment

Thank you

Answer 2

Explanation:

p1=1/25×100 m=4D

p2=1/-10×100=-10D

power of accommodation, p=p1+p2

=4+(-10)=4-10=-6