Q74 / 90 · JEE Main 2019 (09 Jan Shift 2) · Physics

In a young's double slit experiment, the slits are placed $0.320 m m$ apart. Light of wavelength $λ = 500 n m$ is incident on the slits. The total number of bright fringes that are observed in the angular range $- 30^{o} \leq θ \leq 30^{o}$ is:

A
$321$
Correct answer
B
641
C
320
D
$640$

Solution

d s i n θ = n λ

n = \frac{0.320 \times 10^{- 3} \times \frac{1}{2}}{500 \times 10^{- 9}}

= 320

Hence number of maxima

= 320 \times 2 + 1 = 641

Hence, the correct answer is option: 'B'.

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