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

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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 25?

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

## What is the power of convex lens of focal length 1 m?

Answer: 1 dioptre is SI unit of the power of a lens whose focal length is 1 metre. It is denoted by the letter D. Thus 1D = 1 m-1.

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

∴ p = 1 80 × 10 2 = 100 80 = 1.25 D .

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

Therefore, the correct answer for the given question is option (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 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.

## How do you calculate the power of a convex lens?

The diopter is the unit of measure for the power of a lens. Convex lens power is defined as the ability of the lens to converge the rays of light which fall on it as shown in the below figure. It can mathematically be defined as P = 1f, where f is the focal length.

## What is the power of lens if it’s focal length is 1 centi meter * 1 point?

Power of a lens is +2.

## What is power of convex lens?

The power of a lens is defined as the reciprocal of the focal length. … 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 lens of focal length 20cm?

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

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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 lens whose focal length is 50 cm?

= 100/50 = 2 dioptre. The SI unit of power is dioptre.

## What is the power of concave lens of focal length 80 cm?

Thanks for the question ! => Focal length = 80 / 100 = 0.8 meters. Since the focal length and Power is positive, the lens is Converging lens or Convex Lens.

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

Power of lens = 1/f = 1/(-0.8) = -1.25 D.

## What is power of a concave lens of focal length 4m?

So, the power of the lens is 0.25 D.

## What is the power of concave lens of focal length 200?

Hence, The power of the concave lens is -0.5 D.

= -50 dioptres.