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## What will be the power of a concave lens of focal length 0.5 m?

Answer: In the same way, a power of **-2.0D** means a concave lens of focal length -0.5m.

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

The distance between the pole and the principal focus is called the focal length (f) of the lens. The given focal length of the concave lens is **f = -2 m**. It is negative because a concave lens always has a negative focal length. The unit of power is dioptre (D) and 1D = 1m^{–}^{1}.

## What is the power of a 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**.

## What is the power of a lens with focal length 50 cm also write the nature of the lens?

Therefore the lens with focal length 50 cm is convex lens. Here the Power **is negative value**. Therefore the lens with focal length -50 cm is concave lens. The image which is formed by the concave lens is virtual, erect and diminished irrespective of the “position of the object”.

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

In this question it is given that the lens is convex, and its focal length is $25$ cm. First we will convert the focal length in meters. As it is a convex lens so its power is positive. Thus, the power of the lens is **$+ 4D$.**

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

The power of a convex lens (converging lens) is **positive as its focal length is positive**. The power of a concave lens (diverging lens) is negative as its focal length is negative. The power of a plane glass plate is 0.

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

= **-50 dioptres**.

## What is the power of a concave lens of focal length 75 cm?

POWER = 1/F (metres) » POWER = 100 / -75 = -(4/3) = **1.33 DIOPTRES**.

## 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 a convex lens of focal length 5 cm?

The magnifying power of the convex lens is **6**.

## What is the power of a convex lens whose focal length is 80 cm?

∴ p = 1 80 × 10 2 = 100 80 = **1.25 D** .

## What is power of a convex lens having focal length 0.4 m?

So, Power of convex lens is **+ 2.5 D**.

## Is lens a power?

The power of a lens is defined as **the reciprocal of the focal length**. Lens power is measured in dioptres (D). Converging (convex ) lenses have positive focal lengths, so they also have positive power values. Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.

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

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

## What is power of lens and its unit?

Answer: Power of lens is known as the inverse of the focal length of the lens measured in meter(m). S.I unit of **power = Dioptre (D)** Power of lense = 1/ focal length in meter.