Optics - Physics Previous Year Questions

Unpolarised light falls on two polarising sheets placed one on top of other. If the intensity of transmitted light is one fourth of the incident light, the angle between them is

If an object of height \(6 \mathrm{~cm}\) is viewed through a liquid of refractive index \(\frac{4}{3}\) vertically at a depth of \(10 \mathrm{~cm}\). Then what will be its apparent height and apparent distance from the surface of liquid.

The focal length of thin convex lens for red and blue rays are \(100 \mathrm{~cm}\) and \(98.01 \mathrm{~cm}\), respectively. There, the dispersive power of the material of the lens is

A light ray of wavelength 546 nm is incident on an air-glass interface. If the speed of light in air is $3 \times 10^8 \mathrm{~m} / \mathrm{s}$. Then, wavelength of light ray in glass will be

[Take, refractive index of glass, $\mu=1.5$ ]

The distance of moon form the earth is \(3.8 \times 10^5 \mathrm{~km}\). Supposing that the eye is most sensitive to the light of wavelength \(550 \mathrm{~nm}\), the separation of two points on the moon that can be resolved by a \(500 \mathrm{~cm}\) telescope is

A plane glass mirror of thickness \(3 \mathrm{~cm}\) of material of \(\mu=\frac{3}{2}\) is silvered on the back surface. When a point object is placed \(9 \mathrm{~cm}\) from the front surface of the mirror, then the position of the brightest image from the front surface is