Question: Q. 4. How does the angular separation between fringes in single-slit diffraction experiment change when the distance of separation between the slit and screen is doubled?

[O.D. I, II, III, 2012]

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Solution:

Ans. No change. [CBSE Marking Scheme 2012] 1

Short Answer Type Questions-I

[II Q. 1. Draw the intensity pattern for single slit diffraction and double slit interference. Hence, state two differences between interference and diffraction patterns.

U] [OD, Foreign 2017]

Differences :

Interference Diffraction
All maxima have
equal intensity
All fringes have
equal width
Different (changing) width
Superposition of
two wavefronts
Superposition of wavelets
from the same wavefront

(Any two)

[CBSE Marking Scheme 2017]

Commonly Made Error

  • (i) Some students do not know the correct difference between interference of light and diffraction of light.

Detailed Answer :

Intensity Pattern :

Inteference fringe pattern Diffraction fringe pattern

$$ 1 / 2+1 / 2 $$

Difference between Interference and Diffraction :

Interference Diffraction
Fringe width is constant. Fringe width varies.
Fringes are obtained
with the coherent light
coming from two slits.
Fringes are
obtained with the
monochromatic light
coming from single slit.
It is superposition of
waves.
It superposition of
many waves.
It depends upon the
distance between two
openings.
It depends upon the
aperture of single slit
opening.
Many fringes are visible. Fewer fringes are
visible.
All fringes are of same
brightness.
Central fringe has
maximum brightness,
then it reduces
gradually.

(Any two) $1 / 2+1 / 2$



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