Wave Optics - Optics - Physics Previous Year Questions

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 difference is \(\frac{\lambda}{3}\) is

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 light of intensity \(128 \mathrm{~Wm}^{-2}\) is incident on \(P_1\). What is the intensity of light oming out of \(P_3\) ?

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 RI 1.5 is introduced between one of the interfering beams, the shift in the position of central bright fringe is

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 \(x\) from \(O\) is given by (Take, \(d<< D\))

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 equal.

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

For light diverging from a finite point source,

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

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?

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 axes of the polaroids is