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An interference is observed due to two coherent sources separated by a distance $\mathrm{5 \lambda }$ along Y-axis, where $\mathrm{\lambda}$ is the wavelength of light. A detector D is moved along the positive X-axis. The number of point on the X-axis excluding the points $\mathrm{x}=0$ and $\mathrm{x}=\infty$ at which resultant intensity will be maximum, are:
Option: 1
$4$

Option: 2
$5$

Option: 3
$\infty$

Option: 4
$\mathrm{\text { zero }}$

Answers (1)

best_answer

At $\mathrm{x=0, \Delta x=5 \lambda}$

Which corresponds to a maximum.

At $\mathrm{\mathrm{x}=\infty, \Delta \mathrm{x}=0}$ , this also corresponds to a maximum.
$\mathrm{\therefore \quad}$ Other possible maxima between $\mathrm{\mathrm{x}=0}$ and $\mathrm{\mathrm{x}=\infty}$ are $\mathrm{\Delta \mathrm{x}=\lambda, 2 \lambda, 3 \lambda, 4 \lambda}$

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Ritika Kankaria

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