Question

What is meant by the power of a lens? What is its S.I. unit? Name the type of lens
whose power is positive.

The image of an object is formed by lens is real, inverted and of the same size as the
object of the image is at a distance of 40cm from the lens, what is the nature and power
of the lens?
Draw ray diagram to justify your answer.​

Answer 1

Answer:

1 . Power of lens is defined as the reciprocal of the focal length of the lens expressed in meter. SI unit of power is Dioptre denoted by D. Focal length of first lens f1=40 cm=0

2 There are two main types of lenses, known as convex (or converging) and concave (or diverging).Power of lens is known as the inverse of the focal length of the lens measured in meter(m).

3.Power of lense = 1/ focal length in meter. The lense used is a convex lens because the focal length is a positive value. The lense used is a concave lens because the focal length is a negative value.

Explanation:

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