Question

The focal length of the concave lens is
7 m. Calculate the power of lens.​

Answer 1

Answer:

the power of lens =

0.14 Dioptres (approx.)

Answer 2

Answer:

-0.14 Dioptres

Explanation:

Given,

The focal length of the concave lens = 7m

As the lens is concave, focal lenth will be negative, i.e. -7m.

Power of lens = 1/f (in meters)

Power of lens = 1/-7

Power of lens = -0.14 Dioptres

About concave lens:

1. Concave lens will make the rays to diverge.
2. Concave lens forms the virtual image.
3. Images will be upright, virtual, and diminished.