wave-optics Question 31

Question: Q. 10. (i) Write three characteristic features to distinguish between the interference fringes in Young’s double slit experiment and the diffraction pattern obtained due to a narrow single slit.

(ii) A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first minima is at distance of 2.5 mm away from the centre. Find the width of the slit.

A [Foreign 2014]

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Solution:

Ans. (i) Try yourself, similar to Q. 1 Short Answer Type Questions -I

(ii)

yn=nλDd

d=nλDyn

d=1×500×109×12.5×103 m1/2

d=2×104 m(=0.2 mm)1

[CBSE Marking Scheme 2014]



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