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The power of a lens is 1/focal length (measured in meters). So, 50 cm is 1/2 meter, so the power is -2; D stands for diopters, the unit of power for lenses. Hence, the power of a concave lens of focal length 50 cm is -2D.

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

= 100/50 = 2 dioptre.

## What is the power of the convex lens of focal length 50m?

Power of a lens is always reciprocal to the focal length. So, aconvex lens with 50cm focal length has a power of (1/0.5) Dioptre(D) or 2D.

## What would be the power of a concave lens which has a focal length of CM?

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

## What would be the power of concave lens which has a focal length of 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 of focal length 5cm?

So, power of lens is -20 D.

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

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

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

Detailed Solution

The focal length of the concave lens is always negative. Hence, the given focal length is -2m. Formula: Power = 1/focal length. Hence, Power is -0.5 dioptre.

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

∴ p = 1 80 × 10 2 = 100 80 = 1.25 D .

## What is the power of the convex lens whose focal length is 150 cm?

Hence P=1/1.50 m this is = +1.5D.

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

f=-25cm As P=100f,f=100-25=-4dioptre.

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

So a 25 cm. focal length (0.25 meters) has a power of 4 diopters.

## What would be the power of concave lens which has focal length of 20cm?

P =-5 D.

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

P = 1/f = 1/0.5 = +2 D.

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

A lens of focal length 0.5m has a power of 2D. If it is a converging lens (eg. Convex lens) then power will be positive i.e., +2D.

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

Therefore, the lens is convex.