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Q. No.The angular width of the central maximum in the Fraunhofer diffraction for \(\lambda=6000~{\mathring{A}}\) is \(\theta_0\). When the same slit is illuminated by another monochromatic light, the angular width decreases by \(30\%\). The wavelength of this light is:
| 1. | \(1800~{\mathring{A}}\) | 2. | \(4200~{\mathring{A}}\) |
| 3. | \(420~{\mathring{A}}\) | 4. | \(6000~{\mathring{A}}\) |
Subtopic: Â Diffraction |
 77%
From NCERT
NEET - 2019
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