Question

What is the focal length of a lens of power -2.0 D? Identify the type of

lens.
write in 50 to 80 words​

Answer 1

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The power of the lens given is -2D.

It has negative sign, which means that it is a concave lens.

Now, the formula for the power is P = 1/f.

Let's put the given value.

-2 = 1/f

On simplifying we get, f = -1/2 m

By converting the result into centimetres,

we get, f = -1/2 X 100

Therefore, focal length =-50cm.

❥ the above is the answer of your question

❥ hope that's helps you