What is meant by power of lens write its SI unit

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Answer

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A virtual, erect and enlarged image is formed at the same side of Lens, when an object is placed between Principal focus \[\left( {{F}_{i}} \right)\] and optical center \[\left( O \right)\] of a convex lens.

Note:

There are various possibilities to form various (different) types of image at positioning the objects at different positions. For convex lenses there is only one possibility to form Image which is virtual, erect and enlarged.

Answer:

Power of lens is known as the inverse of the focal length of the lens measured in meter(m).

S.I unit of power = Dioptre (D)

Power of lense = 1/ focal length in meter.

The focal length of 1st lense f1 = 40 cm = 0.4 m

The lense used is a convex lens because the focal length is a positive value.

Power of lense = 1/ focal length

P1 = 1/f1

P1 = 1/0.4

P1 = 2.5 D

The focal length of 2nd lense f2 = -20 cm = – 0.2 m

The lense used is a concave lens because the focal length is a negative value.

P2 = 1/f2

P2 = 1/(-0.2)

P2 = -5 D

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