Question

Write lens formula and magnification.

Answer 1

Lens formula:

1. The lens formula is given by, $\frac{1}{\mathrm{v}}-\frac{1}{\mathrm{u}}=\frac{1}{\mathrm{f}}$.
2. Where $v$ distance of the image formed from the optical center of the lens, $u$ is the distance of the object from the optical centre of the lens and $f$is the focal length of the lens.

Magnification:

1. The ratio of the height of an image ($h_i$) to the height of an object ($h_o$) is defined as the magnification of a lens.
2. Also, magnification is equal to the ratio of image distance to that of object distance.
3. The formula is $\mathrm{m}=\frac{{\mathrm{h}}_{\mathrm{i}}}{{\mathrm{h}}_{\mathrm{o}}}$. Also, $m=\frac{v}{u}$