(A) dioptre meter (also known as a lensmeter or focimeter) is an ophthalmic instrument used to measure the refractive power of a lens. Since the power

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(A) dioptre meter (also known as a lensmeter or focimeter) is an ophthalmic instrument used to measure the refractive power of a lens. Since the power of a lens $(P)$ is defined as the reciprocal of its focal length $(f)$ in meters $(P = 1/f)$,the instrument directly measures the dioptric power of spectacle lenses.

Class 10 Science Light – Reflection and Refraction Mix Examples - Light – Reflection and Refraction

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What can be measured using a dioptre meter?

A
Power of a lens
B
Focal length of a lens
C
Radius of curvature of a lens
D
Thickness of a lens

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Light – Reflection and Refraction

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Mix Examples - Light – Reflection and Refraction

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What can be measured using a dioptre meter?

Similar Questions

With the help of a ray diagram,show that the angle of incidence is equal to the angle of reflection when a ray is incident on a concave mirror.

On what factor does the lateral shift produced by a glass slab depend?

$A$ full-length image of a distant tall building can definitely be seen by using:

How will you decide whether a given piece of glass is a convex lens,concave lens,or a plane glass plate?

What happens to the image formed by a convex lens if its lower part is blackened?

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