-
A parallel beam of monochromatic light of wavelength 5000 Å is incident normally on a single narrow slit of width 0.001 mm. The light is focused by a convex lens on a screen placed in focal plane. The first minimum will be formed for the angle of diffraction equal to
-
- 0°
- 15°
- 30°
- 50°
Correct Option: C
For first minimum, a sin θ = nλ = 1λ
| sinθ = | = | = 0.5 | ||
| a | 0.001 × 10-3 |
θ = 30°
