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Question: Answered & Verified by Expert
Conditions of diffraction is
PhysicsWave OpticsAP EAMCETAP EAMCET 2020 (22 Sep Shift 2)
Options:
  • A $\frac{a}{\lambda} \neq 1$
  • B $\frac{a}{\lambda}>>1$
  • C $\frac{a}{\lambda}< < 1$
  • D $\frac{a}{\lambda} \leq 1$
Solution:
1668 Upvotes Verified Answer
The correct answer is: $\frac{a}{\lambda} \leq 1$
For diffraction, the width $a$ of slit must be less than or comparable to wavelength of light used. i.e.,
$$
\frac{a}{\lambda} \leq 1
$$

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