In a Young's double-slit experiment,the experiment is performed with blue light of wavelength $4360 \; \mathring{A}$ and green light of wavelength $5460 \; \mathring{A}$. If the distance of the $4^{th}$ bright fringe from the central maximum is $x$,then:

  • A
    $x(\text{Blue}) = x(\text{Green})$
  • B
    $x(\text{Blue}) > x(\text{Green})$
  • C
    $x(\text{Blue}) < x(\text{Green})$
  • D
    $\frac{x(\text{Blue})}{x(\text{Green})} = \frac{5460}{4360}$

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In $YDSE$,the angular width of a fringe formed on a distant screen is $1^o$. The slit separation is $0.01\,mm$. The wavelength of light is:

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Assertion: $A$ white source of light during interference forms only white and black fringes.
Reason: Width of fringe is inversely proportional to the wavelength of the light used.

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$A$ graph is plotted between the fringe-width $(z)$ and the distance $(D)$ between the slit and the eye-piece,keeping other parameters constant. Which of the following graphs is correct?

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