Optics - Physics Previous Year Questions

Two identical light waves, propagating in the same direction, have a phase difference \(\delta\). After they superpose the intensity of the resulting wave will be proportional to

An unpolarised beam of intensity I\(_0\) is incident on a pair of nicols making an angle of 60\(^\circ\) with each other. The intensity of light emerging from the pair is

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

A person has a normal near point \(25 \mathrm{~cm}\). What is the magnifying power of the simple microscope he used, if the focal length of the convex lens used is \(10 \mathrm{~cm}\) and the final image is formed at the least distance of distinct vision?

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 where the path difference is \(\frac{\lambda}{6}\) and the above point is

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 obtained in Young's double slit experiment with slit separation \(0.20 \mathrm{~mm}\), which can be accommodated within the range of total angular spread of the central maximum due to single slit.