Question

✨The power of a lens is -4.0 D. Find the focal length of the lens and also state the nature if the lens✨

Answer 1

Focal length
f = 1/p
=1/(-4)
= -0.25 m

So focal length is -0.25m
Since, f is negative, lens is concave.

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Answer 2

Thanks for question !

Answer !!!
Given

$The \: \: power \: of \: a \: lens \: is \: \: -4.0 D.$
Using here formula

$p = \frac{1}{f}$
$- 4 = \frac{1}{f}$
$f = \frac{1}{ - 4}$
$f = - 0.25$


as power is -ve it indicates that the lens is a concave lens...


hope this helps ^_^