Wave Optics PYQs - Last 10 Years

In Young's double slit experiment, how many maxima can be seen on a screen (including central maxima) if $d = \dfrac{5\lambda}{2}$ (where $\lambda$ is wavelength of light and $d$ is distance between the two slits).

\(\text { If } \mathrm{AB} \text { is incident plane wave front then refracted wave front in }\left(\mathrm{n}_2>\mathrm{n}_1\right)\)

Three polaroid sheets are co-axially placed as indicated in the diagram. Pass axes of the polaroids 2 and 3 make $30^{\circ}$ and $90^{\circ}$ with pass axis of polaroid sheet 1 . If $I_0$ is the intensity of the incident unpolarised light...

In Young's double slit experiment, an electron beam is used to produce interference fringes of width $\beta_1$. Now the electron beam is replaced by a beam of protons with the same experimental set-up and same speed. The fringe width obtain...

In the Young's double slit experiment, the intensity of light passing through each of the two double slits is \(2 \times 10^{-2} \mathrm{~Wm}^{-2}\). The screen-slit distance is very large in comparison with slit-slit distance. The fringe w...

An unpolarised light of intensity \(I\) is passed through two polaroids kept one after the other with their planes parallel to each other. The intensity of light emerging from second polaroid is \(\frac{I}{4}\). The angle between the pass a...

When light propagates through a given homogeneous medium, the velocities of

When a compact disc (CD) is illuminated by small source of white light coloured bands are observed. This is due to

In case of Fraunhoffer diffraction at a single slit, the diffraction pattern on the screen is correct for which of the following statements?

The fringe width for red colour as compared to that for violet colour is approximately

For light diverging from a finite point source,

In the Young's double slit experiment a monochromatic source of wavelength \(\lambda\) is used. The intensity of light passing through each slit is \(I_0\). The intensity of light reaching the screen \(S_C\) at a point \(P\), a distance $$x...

A slit of width \(a\) is illuminated by red light of wavelength \(6500 \mathop A\limits^o\). If the first diffraction minimum falls at \(30^{\circ}\), then the value of \(a\) is

Which of the following statements are correct with reference to single slit diffraction pattern?
(I) Fringes are of unequal width.
(II) Fringes are of equal width.
(III) Light energy is conserved.
(IV) Intensities of all bright fringes are ...

Two poles are separated by a distance of \(3.14 \mathrm{~m}\). The resolving power of human eye is \(1 \mathrm{~min}\) of an arc. The maximum distance from which he can identify the two poles distinctly is

Three polaroid sheets \(P_1, P_2\) and \(P_3\) are kept parallel to each other such that the angle between pass axes of \(P_1\) and \(P_2\) is \(45^{\circ}\) and that between \(P_2\) and \(P_3\) is \(45^{\circ}\). If unpolarised beam of lig...

In Young's double slit experiment, the distance between the slits and the screen is \(1.2 \mathrm{~m}\) and the distance between the two slits is \(2.4 \mathrm{~mm}\). If a thin transparent mica sheet of thickness \(1 \mu \mathrm{m}\) and R...

If Young's double slit experiment, using monochromatic light of wavelength \(\lambda\), the intensity of light at a point on the screen where path difference is \(\lambda\) is \(K\) units. The intensity of light at a point where path differ...

A plane wavefront of wavelength $\lambda$ is incident on a single slit of width $a$. The angular width of principal maximum is

In Young's double slit experiment, two wavelengths $\lambda_1=780 \mathrm{~nm}$ and $\lambda_2=520 \mathrm{~nm}$ are used to obtain interference fringes. If the $n^{\mathrm{th}}$ bright band due to $\lambda_1$ coincides with $(n+1)^{\text {...

In Young's double slit experiment, slits are separated by 2 mm and the screen is placed at a distance of 1.2 m from the slits. Light consisting of two wavelengths \(6500\mathop A\limits^o\) and \(5200\mathop A\limits^o\) are used to obtai...

In a Fraunhofer diffraction at a single slit, if yellow light illuminating that slit is replaced by blue light, then diffraction bands

According to Huygens' principle, during refraction of light from air to a denser medium

In Young's double-slit experiment, if yellow light is replaced by blue light, the interference fringes becomes

During scattering of light, the amount of scattering in inversely proportional to................ of wavelength of light.

In a system of two crossed polarisers, it is found that the intensity of light from the second polariser is half from that of first polariser. The angle between their pass axes is