Speed of light from frequency and wavelength
c = fλ
Law of reflection
θ1 = θ2
Optics equation
Magnification
Index of refraction
Snell’s law
n1 sin θ1 = n2 sin θ2
Critical angle
Lensmaker’s equation
Power (lens)
Focal length of multiple lens system
Power of multiple lens system
P = P1 + P2 + P3 + ··· + Pn
Magnification of multiple lens system
m = m1 × m2 × m3 × ··· × mn
Positions of dark fringes in slit–lens setup
a sin θ = nλ
Positions of dark fringes in double-slit setup