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In Young’s experiment, two coherent sources are placed 0.90 mm apart and fringe are observed one metre away. If it produces second dark fringe at a distance of 1 mm from central fringe, the wavelength of monochromatic light used would be
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- 60 × 10–4 cm
- 10 × 10–4 cm
- 10 × 10–5 cm
- 6 × 10–5 cm
Correct Option: D
For dark fringe
| x = (2n - 1) | 2d |
| ∴ λ = | = | |||
| (2n - 1)D | (2 × 2 - 1)× 1 |
λ = 0.6 × 10–6 m = 6 × 10–5 cm
