TS EAMCET · Physics · Wave Optics
In a single slit diffraction, the slit is illuminated with light of wavelength \(6000 Å\). If the slit were illuminated by a light of wavelength \(\lambda\) the angular width of the central maximum decreases by \(30 \%\). Then \(\lambda\) is
- A \(6000 Å\)
- B \(4200 Å\)
- C \(3000 Å\)
- D \(1800 Å\)
Answer & Solution
Correct Answer
(B) \(4200 Å\)
Step-by-step Solution
Detailed explanation
Angular width \(\theta=2 \sin ^{-1}\left(\frac{\lambda}{\mathrm{d}}\right)\) or, \(\theta \propto \lambda\) \(\therefore \theta_1=\theta= k \lambda_1 \quad \ldots\) (i) and \(\theta_2=\theta-\theta \times \frac{30}{100}= k \lambda_2\) or,…
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