JEE Mains · Physics · STD 12 - 10. Wave optics
A single slit of width \(a\) is illuminated by a monochromatic light of wavelength \(600\,nm\). The value of \(a\) for which first minimum appears at \(\theta=30^{\circ}\) on the screen will be ........... \(\mu m\)
- A \(0.6\)
- B \(1.2\)
- C \(1.8\)
- D \(3\)
Answer & Solution
Correct Answer
(B) \(1.2\)
Step-by-step Solution
Detailed explanation
As for first minima \(a \sin \theta=\lambda\) \(\Rightarrow a \sin 30^{\circ}=600 \times 10^{-9}\) \(\Rightarrow a =1200 \times 10^{-9}\,m\) \(\Rightarrow a =1.2\,\mu m\)
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