QUESTION #1 Young's Double Slit Experiment

Young's double slit interference apparatus is immersed in a liquid of refractive index 1.44$1.44$. It has slit separation of 1.5\ mathrmmm$1.5\ \mathrm{mm}$. The slits are illuminated by a parallel beam of light whose wavelength in air is 690\ mathrmnm$690\ \mathrm{nm}$. The fringe-width on a screen placed behind the plane of slits at a distance of 0.72\ mathrmm$0.72\ \mathrm{m}$, will be:

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QUESTION #20 Polarization

In a Young's double slit experiment, three polarizers are kept as shown in the figure {{IMG1}}. The transmission axes of P_1$P_{1}$ and P_2$P_{2}$ are orthogonal to each other. The polarizer P_3$P_{3}$ covers both the slits with its transmission axis at 45^circ$45^{\circ}$ to those of P_1$P_{1}$ and P_2$P_{2}$. An unpolarized light of wavelength lambda$\lambda$ and intensity I_0$I_{0}$ is incident on P_1$P_{1}$ and P_2$P_{2}$. The intensity at a point after P_3$P_{3}$ where the path difference between the light waves from s_1$s_{1}$ and s_2$s_{2}$ is fraclambda3$\frac{\lambda}{3}$, is

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