Question

write the equation showing relation between power of lens and focal length​

Answer 1

Answer:

The two main components are

    Power of lens.

   The Focal length of the lens.

 Solution,

It is known that the power of a lens is equal to the inverse or reciprocal of its focal length. (power and focal length are inversely proportional to each other)

Let,

Power of a lens = p

Focal length of that = f

So, from the above mentioned theoretical discussion, we can write that,

The optical power of a lens is equal to the reciprocal of the focal length of the lens.

P = 1/f.

SI unit of power is dioptre (D) and that of focal length is meter (m).

Hence, the mathematical equation has been written.

Answer 2

Equation showing relation between the power of the lens and focal length​:

Following are the two main components are:

• Power of lens.

• The Focal length of the lens.

Solution:

It is known that the power of a lens is equal to the inverse or reciprocal of its focal length. (power and focal length are inversely proportional to each other)

Let,

Power of a lens = p

The Focal length of that = f

So, from the above mentioned theoretical discussion, we can write that,

The optical power of a lens is equal to the reciprocal of the focal length of the lens.

P = 1/f.

SI unit of power is dioptre (D) and that of focal length is meter (m).

Hence, the mathematical equation has been written.