Exercise 1

If the refractive indices of a prism for red, yellow and violet colours be $1.61$,$1.63$ and $1.65$ respectively, then the dispersive power of the prism will be

Minimum deviation is observed with a prism having angle of prism $A$, angle of deviation ,$\mathrm{\delta }$ angle of incidence $i$ and angle of emergence $\mathrm{\delta }$. We then have generally

The refractive index of a material of a prism of angles $45°-45°-90°$ is $1.5$. The path of the ray of light incident normally on the hypotenuse side is shown in the figure.

A students plots a graph between inverse of magnification $1/m$ produced by a convex thin lens and the object distance $u$ as shown in figure. What was the focal length of the lens used?

Which of the following is not due to total internal reflection?

A ray of light travelling in a transparent medium of refractive index $\mu$, falls on a surface separating the medium from air at an angle of incidence of $45°$. For which of the following value of $\mu$ the ray can undergo total internal reflection?

Two convex lenses of power $2 \mathrm{D}$ and $5 \mathrm{D}$ are separated by a distance $\frac{1}{3}\mathrm{m}$. The power of optical system formed is

A ray of light is incident at an angle of incidence $i$ on one face of a prism of angle $A$ (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is $\mu$, the angle of incidence $i$, is nearly equal to