Question

A student uses a lens of focal length 50cm and another of -50cm . what is the nature of the lens and the power used by each of them?

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Answer 1

Hi mate !

Here is your Answer :

Focal length = +50 cm a lens tells that it is convex lens as it focal length inplus it is .. p= 1/f ( focal length) = +0.02 dioptres

Focal length= -50 cm a lens tells that it is concave lens as it focal length in minus it is p= 1/f ( focal length) = - 0.02 dioptres

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Answer 2

Answer:

Step-by-step explanation:

F1=50 cm=0.5m(convex)

F2= -50cm= -0.5m(concave)

Now,

P1=1/f1 P2=1/f2

P1=1/0.5 P2=1/ -0.5

P1=2D P2= -2D

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