Question

The power of the lens is -4.0 diopter what is the nature of this lens

Answer 1

Heya User ______

Here is Your Answer. ...._________

RAY OPTICS

↪We know that ..

↪Power = 1/ focal length ( in metres )

↪so here we get the focal length as ...

↪f = 1/P

↪so here the focal length is -0.25

↪this Indicates that ..the Given lens is a CONCAVE LENS AS IT HAS A NEGATIVE FOCAL LENGTH..
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Answer 2

$\huge{\mathfrak{\underline{Answer}}}$

Given:

Power of the lens(P) = - 4.0 D.

To find:

f = ?

Nature of the lens =?

Explanation:

P = 1/f

To find focal lenght,

f = 1/P

f = 1/-4.0

$\boxed{\it{f = - 0.25}}$

Hence, the focal length is - 0.25cm

This shows that the given lens is concave lens which is also called as diverging lens, with negative focal lenght.