Question

what is the meant power of lens​

Answer 1

Explanation:

Power of lens is known as the inverse of the focal length of the lens measured in meter(m). Power of lense = 1/ focal length in meter.

Answer 2

Answer:

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

Power of lens is the ability of the lens to converge the rays of light falling on it. It can also be defined as P=1/f where f is the focal length. S.I. unit of power is D(Dioptre).

Explanation:

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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 f

1

=40 cm=0.4 m

Since the focal length is positive, so it is a convex lens.

Power of lens P

1

=

f

1

1

=

0.4

1

=2.5 D

Focal length of second lens f

2

=−20 cm=−0.2 m

Since the focal length is negative, so it is a concave lens.

Power of lens P

2

=

f

2

1

=

−0.2

1

=−5 D