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

So, Power of convex lens is + 2.5 D.

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

The correct answer is option 4, i.e. -2.5 D.

What is the dioptric power of a lens with a focal length of?

The lens power or diopter is defined as follows: That is, dividing 1000 by the focal length (in mm) of a lens yields the diopter of that lens. For example, a lens of 50mm has a diopter of 1000/50 = 20, and a lens of 8.9mm has a diopter of 1000/8.9 = 112.4.

What is the power of a lens having a focal length of a 50 cm B?

= 100/50 = 2 dioptre.

What is the power of the combination of lenses of focal length 40 cm and 50 cm?

0.5 D is the power of the combined lenses.

What is the power of convex lens of focal length 20 cm?

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

What is the power of concave lens *?

negative
The power of the concave lens is negative. Concave lens surfaces have a virtual radius of curvature, and thus a negative curvature.

What is dioptric power?

Optical power (also referred to as dioptric power, refractive power, focusing power, or convergence power) is the degree to which a lens, mirror, or other optical system converges or diverges light. It is equal to the reciprocal of the focal length of the device: P = 1/f.

How do you calculate dioptric power?

The diopter is the unit of measure for the refractive power of a lens. The power of a lens is defined as the reciprocal of its focal length in meters, or D = 1/f, where D is the power in diopters and f is the focal length in meters.

What is the power of a lens having a focal length of 50 cm and minus 50 cm?

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

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

What is meant by power of a 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.

What is the focal length of a thin lens?

A thin lens has a focal length of, – 25 cm. What is the power of the lens and what is its nature? A thin lens has a focal length of, -25 cm. What is the power of the lens and what is its nature? Since the focal length is negative, it is a concave lens or diverging lens.

What is the power and focal length of convex lens?

Power = 1/Focal length = 1/ (-1/4) = -4 D Note : – Focal Length of Convex Lens is Positive.

What is the power of a lens?

It is the measure of Degree of Convergence and Divergence of a Light Rays Convex Lens Converges Parallel Rays of Light and Concave Lens Diverges Parallel rays of Light Power of Lens is Defined as Reciprocal of Focal Length If more than 1 one lens are used together, it is called Combination of Lens

Which lenses are diverging and which lenses are converging?

The first lens is diverging, the second lens is converging. The first lens is converging, the second lens is diverging. Both lenses are diverging. Both lenses are converging. Question: A)What is the power of a 39.5cm focal-length lens?