After The School

Key Formulas

Concept	Formula
Refraction at spherical surface	$\dfrac{n_2}{v} - \dfrac{n_1}{u} = \dfrac{n_2 - n_1}{R}$
Lens maker's formula	$\dfrac{1}{f} = (n-1)\left(\dfrac{1}{R_1} - \dfrac{1}{R_2}\right)$
Thin lens formula	$\dfrac{1}{v} - \dfrac{1}{u} = \dfrac{1}{f}$
Prism (min. deviation)	$n = \dfrac{\sin\frac{A+\delta_m}{2}}{\sin\frac{A}{2}}$
Critical angle	$\sin\theta_c = \dfrac{1}{n}$
Telescope magnification	$m = \dfrac{f_o}{f_e}$
Microscope magnification	$m = \dfrac{L}{f_o} \times \dfrac{D}{f_e}$