Question

A student uses a lens of focal length 40cm and another of 20cm write the nature and power of each lens​

Answer 1

Answer: ok

Explanation: Student A:40cm

p=1/f

p=1/0.4 (40cm=40/100m)

p=1x10/4

p=+2.5D

converging or convex lens.

Student B:f=-20cm

P=1/f

p=1/-0.2(-20cm=-20/100)

p=1x10/-2

p=-5D

diverging or concave lens.

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