Question

a thin lens has a focal length of -25 what is the power of lens ?is it convex or concave

Answer 1

→ P= 1/F. [ P= power, F= focal length]

→ P= 1/-25= -0.04 D

→ it is concave lens

__________

Answer 2

Hey......!!! here is ur answer........☺️☺️☺️

We know that the relation between Focal length and Power......

p = 1/f

Here is given that, to

f = –25

then the Power will be.......

p = 1/-25

p = –0.04 ««««Ans.

I hope it will help you......✌️✌️✌️