4. Interference was observed in interference chamber where air was present, now the chamber is evacuated, and if the same light is used, a careful observer will see ?
(a) no interference
(b) interference with brighter bands
(c) interference with dark bands
(d) interference fringe with larger width
Answer : (d) interference fringe with larger width
\(\mu_{\text{vacuum}} = 1 \)
\(\mu_{\text{air}} = 1.0003 \)
\( \lambda_{\text{medium}} = \frac{\lambda}{\mu} \)
\( \beta = \frac{\lambda D}{d} \)
\( \beta_{\text{medium}} = \frac{\lambda_{\text{medium}} D}{d} = \frac{\lambda}{\mu} \cdot \frac{D}{d} \)
\( \beta_{\text{medium}} = \frac{\beta}{\mu} \)
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