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Wave Optics question

2022 · Q161
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Wave Optics question

2022 · Q161

NEETPhysicsWave OpticsMCQ+4 / −1

If the screen is moved away from the plane of the slits in a Young's double slit experiment, then the :

  1. A
    linear separation of the fringes decreases
  2. B
    angular separation of the fringes increases
  3. C
    angular separation of the fringes decreases
  4. D
    linear separation of the fringes increase
View written solutionFree

Correct answer: D

In YDSE,

Separation between fringes is

Related to fringed width $$\beta = {{D\lambda } \over d}$$

If D is increased $\beta$ increases while

Angular separation is independent of distance between slits and screen (D)

As angular separation $$ = {\beta \over D} = {\lambda \over d}$$

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