Wave Optics - Result Question 32
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34. A parallel beam of light of wavelength $\lambda$ is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the second minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of slit is
======= ####34. A parallel beam of light of wavelength $\lambda$ is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the second minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of slit is
3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed:content/english/neet-pyq-chapterwise/physics/wave-optics/wave-optics—result-question-32.md (a) $\pi \lambda$
(b) $2 \pi$
(c) $3 \pi$
(d) $4 \pi$
[NEET Kar. 2013]
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Answer:
Correct Answer: 34. (d)
Solution:
- (d) Conditions for diffraction minima are
Path diff. $\Delta x=n \lambda$ and Phase diff. $\delta \phi=2 n \pi$
Path diff. $=n \lambda=2 \lambda$
Phase diff. $=2 n \pi=4 \pi(\because n=2)$
35 .
(d) $\delta \phi=1.22 \frac{\lambda}{D}=1.22 \frac{5000 \times 10^{-10}}{10 \times 10^{-2}}=6.1 \times 10^{-6}$ $\therefore$ Order $=10^{-6}$
