Question

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Q. A lens has a power of + 2.0 Diopter. Which one of the following statements about the lens is true?
1) The lens is concave and has a focal length of 0.5 meter
2) The lens is convex and has a focal length of 0.5 meter
3) The lens is convex and has a focal length of 0.5 meter
4) The lens is concave and has a focal length of 2.0 meter

✳️give right answer brainlian​

Answer 1

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 meters (that is, 1/f metres). It is thus a unit of reciprocal length.

Hence, P= 0.25m / 1 =4.

As the value is positive, it is a positive lens, that is, convex. Hence, the option A is true.

P=P 1 +P 2 =+2−1=+1 diopter, lens behaves convergent

F= P 1 = 11 =1m=100cm

hope it helps u mate

Answer 2

Answer:

4) The lens is concave and has a focal length of 2.0 meter. is right answer.

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