Question

the focal length of the concave lens is 7m calculate the power of the lens

Answer 1

Answer:

0.14 Dioptres (approx.)

Explanation:

Focal length=-7 m

We know that,

Power=1/f(in metres)

P=1/-7

P=-0.14 D (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:

Concave lens will make the rays to diverge.

Concave lens forms the virtual image.

Images will be upright, virtual, and diminished.