List of top Physics Questions on Youngs double slit experiment asked in CBSE CLASS XII

The phase difference between the two superimposing waves that give rise to a bright spot in a Young’s double-slit experiment is (\(n\) is an integer) :

In a Young’s double-slit experiment, a beam of light consisting of two wavelengths 500 nm and 600 nm is used. The interference fringes are observed at a screen placed 1.8 m away from the plane of slits (slit separation 0.3 mm). Calculate the least distance from the central maximum where the bright fringes due to both the wavelengths coincide.

In a Young's double-slit experimental set-up with slit separation \(0.6\ \text{mm}\), a beam of light consisting of two wavelengths \(440\ \text{nm}\) and \(660\ \text{nm}\) is used to obtain an interference pattern on a screen kept \(1.5\ \text{m}\) in front of the slits. Find the least distance of the point from the central maximum where the bright fringes due to both the wavelengths coincide.

The shape of the interference fringes in Young's double-slit experiment, when the distance between the slit and the screen is very large as compared to the slit separation, is nearly

Assertion (A) : In Young's double-slit experiment, the fringe width for dark and bright fringes is the same. Reason (R) : Fringe width is given by \[ \beta=\frac{\lambda D}{d}, \] where symbols have their usual meanings.

A beam of coherent light of wavelength $550\text{ nm}$ is incident normal to the plane of a pair of two slits $S_1$ and $S_2$ each of width $1.2 \times 10^{-6}\text{ m}$ separated by $1.1\text{ mm}$. Dark and bright fringes are observed on a screen $2.2\text{ m}$ away from the plane of the slits.
Calculate :
(I) fringe width.
(II) distance of the second dark fringe from the central maximum.
(III) what will happen when the entire apparatus is immersed in water.

In a Young’s double-slit experiment, a beam of light consisting of two wavelengths 500 nm and 600 nm is used. The interference fringes are observed at a screen placed 1.8 m away from the plane of slits (slit separation 0.3 mm). Calculate the least distance from the central maximum where the bright fringes due to both the wavelengths coincide.

In a Young's double-slit experimental set-up with slit separation \(0.6\ \text{mm}\), a beam of light consisting of two wavelengths \(440\ \text{nm}\) and \(660\ \text{nm}\) is used to obtain an interference pattern on a screen kept \(1.5\ \text{m}\) in front of the slits. Find the least distance of the point from the central maximum where the bright fringes due to both the wavelengths coincide.

The shape of the interference fringes in Young's double-slit experiment, when the distance between the slit and the screen is very large as compared to the slit separation, is nearly

Assertion (A) : In Young's double-slit experiment, the fringe width for dark and bright fringes is the same. Reason (R) : Fringe width is given by \[ \beta=\frac{\lambda D}{d}, \] where symbols have their usual meanings.

A beam of coherent light of wavelength $550\text{ nm}$ is incident normal to the plane of a pair of two slits $S_1$ and $S_2$ each of width $1.2 \times 10^{-6}\text{ m}$ separated by $1.1\text{ mm}$. Dark and bright fringes are observed on a screen $2.2\text{ m}$ away from the plane of the slits.
Calculate :
(I) fringe width.
(II) distance of the second dark fringe from the central maximum.
(III) what will happen when the entire apparatus is immersed in water.

Assertion : In Young’s double-slit experiment, the fringe width for dark and bright fringes is the same.
Reason (R): Fringe width is given by \( \beta = \frac{\lambda D}{d} \), where symbols have their usual meanings.