Question

In a biprism experiment, the distance of 20^th bright band from the centre of interference pattern is 8 mm. The distance of 30^th bright band from the centre is –

• A. 10 mm
• B. 12 mm
• C. 14 mm
• D. 16 mm

Answer 1

Answer: (B)

12 mm

Answer 2

y µ n ̃ $\frac{y_{30}}{y_{8}}$ µ $\frac{30}{20}$̃ y₃₀ =$\frac{30}{20}$× 8 = 12 mm