Question

.
If two lenses are combined whose powers are P, and P2, what would be the net power of
the combination?
(a) Poet= P + P2
(b) Pnet = P1-P2
(c) Pinet = P,/P
(d) Pne = P2/P​

Answer 1

Answer:

The reciprocal of the focal length of a lens in metres is called the power of the lens.

The capacity of a lens to bend the rays of light depends upon the focal length. The smaller the focal length, the greater is the bending of a ray of light and vice- versa. Thus the power of a lens to bend the rays of light is inversely proportional to the focal length of the lens.

Units of power of a lens : The units of the power of a lens are dioptres.

One dioptre is the power of a lens of one metre focal length. The power of a lens is denoted by D. It is this dioptric number which the doctors prescribe for the spectacles of a person.

Mathematically, D = 1/Focal length in metre

= 100/Focal length in centimetre

Explanation:

Answer 2

Answer:

its option c p1/p2

may be its help you