Write the Lensmakers formula and explain the terms in it.

Lensmaker's formula is a formula used to calculate the focal length of a thin lens. It is derived from the laws of refraction and is given by the following equation:

1/f = (n - 1) * (1/R₁ - 1/R₂)

Where:

• f is the focal length of the lens
• n is the refractive index of the lens material
• R₁ is the radius of curvature of the first surface of the lens
• R₂ is the radius of curvature of the second surface of the lens