24.1 Double Slit Interference

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Double Slit Interference

DOUBLE SLIT INTERFERENCE
Bright
Fringes
d sin θbright = m λ          m = 0, ±1, ±2 ...
                                     d = distance between slits
ybright = (λL / d ) m        λ= wavelength
                                     L = distance to screen
Dark
Fringes
d sin θdark = (m + ½) λ       m = 0, ±1, ±2 ...
                                          d = distance between slits
ydark = λL / d (m + ½)         λ= wavelength
                                          L = distance to screen