Question

Find the focal length of a lens of power-2.0 D. What type of lens is this?​

Answer 1

Given :-

• Power of a lens = - 2.0 D

To Find :-

• Focal length of the lens
• Type of lens

Formula used :-

• $Focal \: length = \: \frac{1}{power}$

Putting the values, we get,

$= > focal \: length= \frac{1}{ - 2} \: \: \\ = > focal \: length = - 0.5$

Therefore,

• Focal length of the lens = - 0.5
• Since, it is in negative therfore, its a concave lens.

Hope the answer helps you mate ;)