Question

A student uses a lens of focal length 40cm and another of -20cm. Write the nature and power of each lens.

Answer 1

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.

Answer 2

Concept Introdution:-

It is a scientific study where natural forces such as light, sound, heat, electricity and also pressure, etc.

Explanation:-

We have been given a statement.

We have to find nature and power.

Final Answer:-

The final answer is

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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