(D) The Assertion is incorrect because a white light source produces coloured fringes,not just white and black ones. This is because the central fring

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If both the Assertion and Reason are incorrect.

(D) The Assertion is incorrect because a white light source produces coloured fringes,not just white and black ones. This is because the central fringe is white,but subsequent fringes are coloured due to the different wavelengths present in white light.The Reason is also incorrect because the fringe width $\beta$ is given by the formula $\beta = \frac{\lambda D}{d}$,which shows that the fringe width is directly proportional to the wavelength $\lambda$ of the light used,not inversely proportional.Therefore,both the Assertion and the Reason are incorrect.

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

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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.

AIIMS 2007 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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$A$ double slit of separation $1.5\, mm$ is illuminated by white light (between $4500\, \mathring{A} - 7000\, \mathring{A}$). On a screen $120\, cm$ away,a coloured interference pattern is formed. If a pinhole is made on this screen at a distance $3.0\, mm$ from the central white fringe,which of the following wavelengths will be absent in the transmitted light? (in $\mathring{A}$)

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In a Young's double-slit experiment,the wavelength of light used is $6000 \, \mathring A$. The phase difference between the central bright fringe and the third bright fringe is .......

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In a Young's double-slit experiment,$12$ fringes are observed to be formed in a certain segment of the screen when light of wavelength $600 \ nm$ is used. If the wavelength of light is changed to $400 \ nm$,the number of fringes observed in the same segment of the screen is:

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In Young's double slit experiment,if the wavelength of the light used is doubled and the distance between the two slits is halved,the resultant fringe width becomes $n$ times the initial fringe width. Find the value of $n$.

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In a $YDSE$ apparatus,if we use white light,then:

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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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In a Young's double-slit experiment,the wavelength of light used is $6000 \, \mathring A$. The phase difference between the central bright fringe and the third bright fringe is .......

In a Young's double-slit experiment,$12$ fringes are observed to be formed in a certain segment of the screen when light of wavelength $600 \ nm$ is used. If the wavelength of light is changed to $400 \ nm$,the number of fringes observed in the same segment of the screen is:

In Young's double slit experiment,if the wavelength of the light used is doubled and the distance between the two slits is halved,the resultant fringe width becomes $n$ times the initial fringe width. Find the value of $n$.

In a $YDSE$ apparatus,if we use white light,then:

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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.