# What is the focal length of a convex lens having power 0 5 D?

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∴ Focal length = 20 cm. (Positive for convex lens.)

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

Hence,the focal length of the lens is -0.2 metres.

## What is the focal length of a convex lens having power 0.5 D?

=>f=200cm or 2 metres (Ans.)

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

Answer: Focal length f= 1/p So according to the question power is +2.0 D f= 1/2.0 = 0.5 m In centimeter …the focal length is 50cm.

## What is focal length of 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.

## When a convex lens of power +5 D is placed in contact with a concave lens of power 2 d the power of the combination is?

The combined power is the algebraic sum of the individual powers of the lenses. Therefore, the power of the combination of the lenses is – 2.5 D.

## What power does 0.5 d have?

A concave lens of focal length 2 m.

## Which lens has a power of 0.5 D?

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

## What is the nature of a lens having power of 0.5 D?

Therefore, the lens is convex.

## What is the focal length of a lens whose power is 2.5 D?

The focal length will be,-40 cm.

## What is the power of a concave lens whose focal length is 75.0 cm?

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

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

So, the power of a concave lens is (-5 D).

## What is the power of convex lens of focal length 40 cm?

A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of the combination is. P=1f=1f1+1f2=10.4+1-0.25=-1.5diopter.

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## What is the nature of lens of power 2.0 D?

Therefore, it is a concave lens.

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

∴ Focal length = 20 cm.