Wave Optics PYQs - Last 5 Years

In a Young's double slit experiment, the slits are separated by 0.5 mm . Fringes are obtained on a screen which is placed at distance 1 m away from the slits. When the screen is moved 7 cm farther away, the fringe width changes by $63 \mu \...

A diffraction pattern due to a single slit of width 0.12 mm is obtained with a blue green light of wavelength 500 nm . The angular separation between central maximum and second order secondary maximum of the diffraction pattern is

In a Young's double slit experiment, the slit separation is 1.5 mm . The setup is illuminated simultaneously by light of wavelengths $6000 \mathop {\rm{A}}\limits^{\rm{o}}$ and $8000 \mathop {\rm{A}}\limits^{\rm{o}}$. The screen is placed a...

In a single slit diffraction experiment, the diffraction pattern is observed on a screen placed at a distance of 2 m from the slit of 1 mm width. If the distance between the first dark fringe on either side of the central to right fringe is...

The width of the fringes obtained with a light of wave length $6.2 \times 10^{-8} \mathrm{~m}$ is 1.82 mm . If the whole apparatus is immersed in a liquid of refractive index 1.3 , what will be the width of the resulting fringe?

If the intensity of the central maximum in the Young's double slit experiment is $\mathrm{I}_0$, what will be the intensity at the same region when one of the slits is blocked by an opaque object?

Two coherent waves of intensities $I_1$ and $I_2$ pass through a region at the same time in the same direction. The sum of maximum to minimum intensities is

In a single slit Fraunhofer diffraction pattern obtained at normal incidence, at the angular position of the second diffraction minimum the phase difference (in radian) between the waves from the opposite edges of the slit is

The wavelength of a monochromatic light which is used in single slit diffraction is 800 nm . The width of the single slit for which the first minimum appears at $\theta=45^{\circ}$ on the screen will be:

The interference pattern is obtained with two coherent light sources of intensity ratio $9: 1$.
The ratio of $\frac{I_{\operatorname{MAX}}+I_{\operatorname{MIN}}}{I_{\operatorname{MAX}}-I_{\operatorname{MIN}}}$ is $\frac{\alpha}{\beta}$. Th...

Young's double slit experiment is first done in air and then in a medium of refractive index $\mu$. If the 7 th dark fringe in the medium lies where the 4 th bright fringe is in air, then the value of $\mu$ is :

An EM wave of frequency $5 \times 10^9 \mathrm{~Hz}$ falls normally on a rectangular slit of width 3 cm . What is the total angular width of the central maxima?

A monochromatic light of wave length $6000^{\circ} \mathrm{A}$ is passed through two media A and B of thickness 10 cm and 16 cm respectively. The number of waves in $A$ is $\frac{1}{2}$ that of $B$. If the refractive index of $A$ is $\frac{...

In the Young's double slit experiment, when a monochromatic light is used, fringe width obtained is 1 mm . If the wave length is halved and the slit width is doubled, what will be the new fringe width?

The width of the fringes obtained in the Young's double slit experiment is \(2.6 \mathrm{~mm}\) when light of wave length \(6000^{\circ} \mathrm{A}\) is used. If the whole apparatus is immersed in a liquid of refractive index 1.3 the new fr...

When light wave passes from a medium of refractive index '\(\mu\)' to another medium of refractive index '\(2 \mu\)' the phase change occurs to the light is :

In a single slit diffraction experiment, for slit width '\(\alpha\)' the width of the central maxima is '\(\beta\)'. If we double the slit width then the corresponding width of the central maxima will be:

In the Young's double slit experiment \(n^{\text {th }}\) bright for red coincides with \((n+1)^{\text {th }}\) bright for violet. Then the value of '\(n\)' is: (given: wave length of red light \(=6300^{\circ} \mathrm{A}\) and wave length o...

A monochromatic light of wavelength \(800 \mathrm{~nm}\) is incident normally on a single slit of width \(0.020 \mathrm{~mm}\) to produce a diffraction pattern on a screen placed \(1 \mathrm{~m}\) away. Estimate the number of fringes obtain...

Incident light of wavelength \(\lambda=800 \mathrm{~nm}\) produces a diffraction pattern on a screen \(1.5 \mathrm{~m}\) away when it passes through a single slit of width \(0.5 \mathrm{~mm}\). The distance between the first dark fringes on...

Two narrow parallel slits illuminated by a coherent monochromatic light produces an interference pattern on a screen
placed at a distance \(\mathrm{D}\) from the slits. The separation between the dark lines of the interference pattern can b...

In Young's double slit experiment light of wavelength \(500 \mathrm{~nm}\) is used to form interference pattern. A uniform glass plate of refractive index 1.5 and thickness \(0.1 \mathrm{~mm}\) is introduced in the path of one of the interf...

In Young's double slit experiment, the ratio of intensities of light from one slit to the other is \(9: 1\). If Im is the maximum intensity, what is the resultant intensity when they interfere at phase difference \(\phi\) ?

In Young's double slit experiment, the intensity of light at a point on the screen where the path difference is \(\lambda\) is \(\mathrm{K}\) units (\(\lambda\) is the wavelength of light used). The percentage change in intensity at a point...

A slit of width \(10 \times 10^{-7} \mathrm{~m}\) is illuminated by light of wavelength \(500 \mathrm{~nm}\). Angular position of the first minimum is

In Young's double slit experiment the ratio of phase difference between light waves reaching the third bright fringe and third dark fringe is

A light having wavelength \(6400^{\circ} \mathrm{A}\) is incident normally on a slit of width \(2 \mathrm{~mm}\). Then the linear width of the central maximum on the screen kept \(2 \mathrm{~m}\) from the slit is :

In the young's double slit experiment the fringe width of the interference pattern is found to be \(3.2 \times 10^{-4} \mathrm{~m}\), when the light of wave length \(6400^{\circ} \mathrm{A}\) is used. What will be change in fringe width if ...

In Young's double slit experiment, the ratio of maximum and minimum intensities in the fringe system is \(9: 1\). The ratio of amplitudes of coherent sources is

In Young's double slit interference experiment, using two coherent waves of different amplitudes, the intensities ratio between bright and dark fringes is 3 . Then, the value of the ratio of the amplitudes of the wave that arrive there is

In Young's double slit experiment, the fringe width is found to be 0.4 mm. If the whole apparatus is immersed in a liquid of refractive index \(\frac{4}{3}\) without changing geometrical arrangement, the new fringe width will be

In Young's double slit experiment, the two slits are separated by 0.2 mm and they are 1 m from the screen. The wavelength of the light used is 500 nm. The distance between 6th maxima and 10th minima on the screen is closest to