Question

What is the mirror formula and lens formula

Answer 1

$\huge\bf\mathfrak\pink{Hello!}$

Mirror Formula:

$\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$

v = Distance of image from pole of mirror

u = Distance of object from pole of mirror

f = Focal length of the mirror

Lens Formula:

$\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$

v = Distance of image from pole of mirror

u = Distance of object from pole of mirror

f = Focal length of the mirror

Answer 2

Lens formula is given by

1/f = 1/v - 1/u

v  is the distance of image from optical centre of the lens.

u is the distance of object from optical centre of the lens.

f is the focal length of the lens.

This formula works well for both convex lens and concave lens.

The sign values ( + or -) of 'u' and 'v' need to be updated correctly based on the object and image position.

Mirror formula is given by

1/f = 1/v + 1/u

v  is the distance of image from pole of the mirror.

u is the distance of object from pole of the mirror.

f is the focal length of the mirror.

Appropriate sign conventions to be used for image and object distances.

Formula is suitable for convex, concave and plane mirrors.