The spectral lines of sodium D1 and D2 have wavelengths of approximately 5890 A and 5896 A A sodium - Physics - Electromagnetic Waves

Question

The spectral lines of sodium D1 and D2 have wavelengths of
approximately 5890 A and 5896 A A sodium lamp sends incident plane
wave onto a slit of width 2 Jim A screen is located 2 m from the
slit Find the spacing between the first maxima of the two sodium
lines as measured on the screen

Fascinating Divine · Answer

Sin θ=x/D =3/2 λ/a =x=3/2 Dλ/a
For the two wavelength x1 =3Dλ /2A and x 2 = 3Dλ/2
A
Spacing (x 2 -x 1 )= 3D /2a (λ 2 -λ 1 ) =0 9 mm

The spectral lines of sodium D1 and D2 have wavelengths of approximately 5890 A and 5896 A. A sodium lamp sends incident plane wave onto a slit of width 2 Jim. A screen is located 2 m from the slit. Find the spacing between the first maxima of the two sodium lines as measured on the screen.