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Wave Optics

Question

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How would the angular separation of interference fringes in Young’s double-slit experiment change when the distance of separation between slits and screen is doubled?

Solution

In young's double slit experiment,
Angular separation is given by,
$θ = \frac{β}{D} = \frac{λ}{d} .$ $[∵ fringe width β = \frac{λD}{d}]$

Angular seperation does not depend on D i.e., the distance of separation between slits and screen. Therefore, $θ$ remains unaffected.

Some More Questions From Wave Optics Chapter

Let us list some of the factors which could possibly influence the speed of wave propagation:
(i) nature of source.
(ii) direction of propagation.
(iii) motion of source and/or observer.
(iv) wave length.
(v) intensity of the wave.
On which of these factors, if any, does
(a) the speed of light in vacuum,
(b) the speed of light in a medium (say, the glass or water) depend?

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