# Quick Answer: What is the power of concave lens of focal length 2cm?

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= -50 dioptres.

## What is the power of concave lens of focal and 200 cm?

The power of the lens is the reciprocal of the focal length of the lens. We know that, The focal length is the negative for the concave lens. Hence, The power of the concave lens is -0.5 D.

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

Thus, the power of this concave lens is, -0.5 dioptre.

## 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 power of concave lens of focal length?

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 = 1m1.

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

So, the power of the lens is 0.25 D.

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

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

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

Answer: 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 power of concave lens?

The power of the concave lens is negative. Concave lens surfaces have a virtual radius of curvature, and thus a negative curvature. Optical power is denoted by the same convention signs that are used for focal length.

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

The focal length of a concave lens is equal to -2.5 D

Hence in the above case it is given that the focal length is 40cm or 0.4m. So the power =- 1/0.4= -2.5D the sign is used to determine the type of lens used.

## What is focal length of power?

The power of a lens is defined as reciprocal of the focal length of the lens. A lens of small focal length has a large power of converging or diverging a parallel beam of light. The power of the lens is 1 diopter if its focal length is 1 m.

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

focal length of lens is 40cm and it is convex lens . so nature of lens is converging.