(D) In Young's double slit experiment,the fringe width is given by $\beta = \frac{\lambda D}{d}$. Since the fringe width depends only on the wavelengt

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(D) In Young's double slit experiment,the fringe width is given by $\beta = \frac{\lambda D}{d}$. Since the fringe width depends only on the wavelength $\lambda$,the distance between slits $d$,and the distance to the screen $D$,the fringe width for dark and bright fringes is the same. Thus,the Assertion is incorrect.When white light is used as a source,the central fringe is white,and the subsequent fringes are coloured because different wavelengths have different fringe widths. Black fringes are not observed in the same way as monochromatic light. Thus,the Reason is also incorrect.

Class 12 Physics Wave Optics Young's Double Slit Experiment (YDSE)

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Assertion: In Young's experiment,the fringe width for dark fringes is different from that for bright fringes.
Reason: In Young's double slit experiment,if the fringes are performed with a source of white light,then only black and bright fringes are observed.

AIIMS 2001 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

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Wave Optics

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Young's Double Slit Experiment (YDSE)

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Two slits are separated by a distance of $0.5\, mm$ and illuminated with light of $\lambda = 6000\ \mathring A$. If the screen is placed $2.5\, m$ from the slits,the distance of the third bright fringe from the centre will be........$mm$.

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In a double slit interference experiment, the fringe width obtained with a light of wavelength $5900 \text{ Å}$ was $1.2 \text{ mm}$ for parallel narrow slits placed $2 \text{ mm}$ apart. In this arrangement, if the slit separation is increased by one-and-half times the previous value, then the fringe width is (in $ \text{ mm}$)

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In an interference pattern,if the ratio of slit widths is $1:9$,find the ratio of maximum to minimum intensity.

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In Young's double slit experiment,the slits are $0.5\, mm$ apart and interference pattern is observed on a screen placed at a distance of $1.0\, m$ from the plane containing the slits. If the wavelength of the incident light is $6000\ \mathring A$,then the separation between the third bright fringe and the central maxima is......$mm$.

Medium

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The Young's double slit experiment is performed in succession using blue light of wavelength $4360 \, \mathring{A}$ and green light of wavelength $5460 \, \mathring{A}$. If the distance of the fourth maximum from the central maximum is $x$,then:

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Assertion: In Young's experiment,the fringe width for dark fringes is different from that for bright fringes.Reason: In Young's double slit experiment,if the fringes are performed with a source of white light,then only black and bright fringes are observed.

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Two slits are separated by a distance of $0.5\, mm$ and illuminated with light of $\lambda = 6000\ \mathring A$. If the screen is placed $2.5\, m$ from the slits,the distance of the third bright fringe from the centre will be........$mm$.

In an interference pattern,if the ratio of slit widths is $1:9$,find the ratio of maximum to minimum intensity.

The Young's double slit experiment is performed in succession using blue light of wavelength $4360 \, \mathring{A}$ and green light of wavelength $5460 \, \mathring{A}$. If the distance of the fourth maximum from the central maximum is $x$,then:

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Assertion: In Young's experiment,the fringe width for dark fringes is different from that for bright fringes.
Reason: In Young's double slit experiment,if the fringes are performed with a source of white light,then only black and bright fringes are observed.