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## What is the power of lens of focal length 20 cm?

The power of a lens of focal length 20cm is **5D**.

So both lenses have same convergence of refracted light. The diopter is the unit of measure for the refractive power of a lens.

## What is the power of a concave lens of focal length?

The power of the lens is the reciprocal of the focal length of the lens. We know that, The focal length is the negative for the concave lens. Hence, The power of the concave lens is **-0.5 D**.

## What is power of a concave lens of focal length 25cm?

As we know that the focal length of a convex lens is taken as in positive sign and focal length of a concave lens is taken negative. So, the power of a convex lens is positive, and the power of a concave lens is **negative**. In this question it is given that the lens is convex, and its focal length is $25$ cm.

## What is the power of concave lens?

The power of the concave lens is **negative**. Concave lens surfaces have a virtual radius of curvature, and thus a negative curvature. Optical power is denoted by the same convention signs that are used for focal length.

## What is the power of lens if its focal length is 50 cm?

= 100/50 = **2 dioptre**.

## Is the focal length of convex lens is 20 cm find the power of lens?

p = 1/f=1/20=100/20=**5 diopter**.

## What is the power of a concave lens of focal length 2 cm?

= **-50 dioptres**.

## What will be the power of concave lens focal length 2 meters?

So, the power of the concave lens is **-0.5 D**.

## What is the power of concave focal length 2m?

Thus, the power of this concave lens is, **-0.5 dioptre**.

## What is the power of convex lens of focal length 0.5 m?

Thus, a diverging lens having a focal length of 1 m has a power of -1 diopter, and a converging lens of focal length 0.5 m has a power of **two diopters**.

## Is the power of a lens is 2D What is the focal length?

Answer: Power of a lens is -2D, negative sign indicates it is a Concave lens. Focal length (in meters)=1/power of the lens, thus focal length=1/2=0.5m=**50cm**.

## Is power of convex lens positive?

Additional Information: Power of convex lens **is positive as it converges the light rays incident on it**. Convex lens is also referred to as a converging lens.