Diffraction from a Wide Slit – Rankers Physics

Diffraction: Practice Problem & Solution

Assertion (A): We cannot get diffraction pattern from a wide slit illuminated by monochromatic light. Reason (R): In diffraction pattern, all the bright bands are not of the same intensity.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Solution Explained:

To solve this problem, we apply the core principles of Diffraction. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion (A) is true in a practical sense; a very wide slit (\(a \gg lambda\)) yields a pattern with very small angular spread, making it indiscernible. Reason (R) is true; the intensity of secondary maxima decreases rapidly. (R) does not explain (A).

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