Wave Optics - Optics - Physics Previous Year Questions

In a young's double slit arrangement fringes are produced using light of wavelength 4000 \(\mathop A\limits^o\). One slit is covered by a thin plate of glass of refractive index 1.4 and the other with another glass plate of same thickness but of refractive index 1.7. By doing so the central bright shifts to original sixth fringe from centre. Thickness of glass plate is ................. .

In a YDSE, the light of wavelength \(\lambda=5000\mathop A\limits^o\) is used, which emerges in phase from two slits at \(a\) distance \(d=3 \times 10^{-7} \mathrm{~m}\) apart. A transparent sheet of thickness \(t=1.5 \times 10^{-7} \mathrm{~m}\) and refractive index \(\mu=1.25\) is placed over one of the slits. What is the new angular position of the central maxima of the interference pattern, from the centre of the screen? Find the value of \(y\).

In a Young's double slit experiment for a particular wavelength of light the distance between third dark and fifth bright fringe is 1.63 mm . If the distance between two slit is 1 mm and distance between slit and screen is 1 metre. Then, the wavelength of light is

A beam of light travelling in water strikes a glass plate which is also immersed in water. When the angle of incidence is $60^{\circ}$, the reflected beam is found to be plane polarised. Find the refractive index of glass, if refractive index of water is $\sqrt{2}$.