(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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If both the Assertion and Reason are incorrect.

(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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In Young's double slit experiment,if monochromatic light is replaced by white light:

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In a Young's double slit experiment,$15$ fringes are observed on a small portion of the screen when light of wavelength $500 \; nm$ is used. Ten fringes are observed on the same section of the screen when another light source of wavelength $\lambda$ is used. Then the value of $\lambda$ is (in $nm$):

MediumJEE MAIN 2020

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In Young's double slit experiment,the two slits act as coherent sources of equal amplitude $A$ and wavelength $\lambda$. In another experiment with the same setup,the two slits are of equal amplitude $A$ and wavelength $\lambda$ but are incoherent. The ratio of the intensity of light at the mid-point of the screen in the first case to that in the second case is

DifficultIIT 1986

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In Young's double slit experiment,the fringe width is $1 \times 10^{-4} \ m$. If the distance between the slit and screen is doubled,the distance between the two slits is reduced to half,and the wavelength is changed from $6.4 \times 10^{-7} \ m$ to $4.0 \times 10^{-7} \ m$,what will be the value of the new fringe width?

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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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In Young's double slit experiment,if monochromatic light is replaced by white light:

In a Young's double slit experiment,the wavelength of red light is $7.8 \times 10^{-5} \,cm$ and that of blue light is $5.2 \times 10^{-5} \,cm$. The value of $n$ for which $(n+1)^{\text{th}}$ blue bright band coincides with $n^{\text{th}}$ bright red band is ..........

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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.