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## What is the focal length of a concave lens having power 5.0 D?

∴ Focal length = **20 cm**.

## What will be the focal length of convex lens whose power is 5.0 D?

we know, power of a lens is reciprocal of its focal length. hence, focal length of convex lens should be **20cm**, if power of it is 5D.

## What is the focal length of a lens with 0.5 D?

Note: The power of the lens is said to be 1 dioptre if the focal length of the lens is 1metre. That means, if the corrective power of the lens is +0.5D, the required lens is a convex lens of focal length **+2m**.

## What is the focal length of a concave lens of power 2.0 D?

Focal length of the lens is **-50cm** or 0.5m.

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

Power **of lense = 1/ focal length in meter**. A concave lens has a negative focal length. Therefore, it is a concave lens.

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Thank you.

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## What will be the focal length of a lens of power +5.0 D what type of lens is it?

The focal length of the given lens. Hence,the focal length of the lens is -0.2 metres. As mentioned in the previous calculation,the given lens has a negative focal length and that’s why the given lens is a **concave lens**. Only concave lenses have negative focal lengths.

## What power does 0.5 d have?

The nature of a lens having a power of + 0.5 D is **Convex lens**.

## What is the power of a convex lens if the focal length is 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 **$+ 4D$.**

## Which lens is used if D value is negative?

The focal length of a convex lens is positive and that of a **concave lens** is negative.

## What is the focal length and nature of the lens whose power is 0.5 D?

the nature of the lens is **convex** because convex lens has converging properties along with being positive. This discussion on A lens has a power of +0.5 D.

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

Answer Expert Verified

The power of the lens given is -2D. It has negative sign, which means that it is a concave lens. Now, the formula for the power is P = 1/f. Therefore, focal length **=-50cm**.