NEET UG 2020 — Optics

If the critical angle for total internal reflection from a medium to vacuum is $45^{\circ},$ then velocity of light in the medium is,

The power of a biconvex lens is $10$ dioptre and the radius of curvature of each surface is $10\mathrm{cm}.$ Then the refractive index of the material of the lens is,

A ray is incident at an angle of incidence $i$ on one surface of a small angle prism (with angle of prism $A$) and emerges normally from the opposite surface. If the refractive index of the material of the prism is $\mu$, then the angle of incidence is nearly equal to:

Assume that light of wavelength $600 \mathrm{nm}$ is coming from a star. The limit of resolution of telescope whose objective has a diameter of $2 m$ is:

The Brewsters angle ${i}_{b}$ for an interface should be

In Young’s double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes:

An object is placed on the principal axis of a concave mirror at a distance of $1.5f$ ($f$ is the focal length). The image will be at,

Two coherent sources of light interfere and produce fringe patterns on a screen. For central maximum, the phase difference between the two waves will be