Physics
Optical power
Calculates optical power P = 1/f with focal length in metres.
Related calculators
Spherical mirror
Calculates the mirror equation 1/f = 1/d_o + 1/d_i and R = 2f.
Thin lens
Calculates 1/f = 1/d_o + 1/d_i and image classification for a thin lens.
Brewster angle
Calculates theta_B = atan(n2/n1) for light incident from medium n1 to n2.
Critical angle
Calculates theta_c = asin(n2/n1) only for n1 > n2.
Magnification and image height
Calculates m = -d_i/d_o and h_i = m*h_o.
Rayleigh resolution
Calculates theta_min = 1.22*lambda/D and small-angle s = L*theta_min for a circular aperture.