Question 1
Define 1 dioptre of power of a lens.

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Solution

A dioptre is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (i.e., 1/metres). It is thus a unit of reciprocal length. In other words,1 dioptre is defined as the power of a lens of focal length 1 metre.

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Question 8
Which of the following statements is true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m.
(b) A convex lens has -4 dioptre power having a focal length -0.25 m.
(c) A concave lens has 4 dioptre power having a focal length 0.25 m.
(d) A concave lens has 4 dioptre power having a focal length -0.25 m.

Q. 1 dioptre is the power of a lens whose focal length is:

Q. The power of three lenses A, B, and C are 1, 2 and 3 dioptre respectively. What is the power of the combination of these lenses?

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Question 1 Define 1 dioptre of power of a lens.

A dioptre is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (i.e., 1/metres). It is thus a unit of reciprocal length. In other words,1 dioptre is defined as the power of a lens of focal length 1 metre.

Question 1
Define 1 dioptre of power of a lens.