Question

In young's experiment total number of maxima that can be obtained over screen with light of wavelength 5000Å and d = 15000Å

• A. 3
• B. 7
• C. 5
• D. 6

Answer 1

Answer: (C)

5

Answer 2

d = 3l

Dx = d sinq = 3l sin q = nl

\ sinq = $\frac{n}{3}$ ; n = – 3, – 2, –1, 0, + 1, + 2, + 3

but n = ± 3 is not possible as q becomes 90⁰