Embibe Experts Solutions for Chapter: Ray Optics, Exercise 1: Assam CEE 2017

An object is placed at a distance $u$ from a microscope of focal length $l$. The angular magnification depends on

The radii of curvature of the spherical surfaces of a biconvex lens are $20 \mathrm{cm}$ and $30 \mathrm{cm}$. The refractive index of the material of the lens is $1.65$. If the lens is submerged in a liquid of refractive index $1.1$, its effective focal length will be

A medium with refractive index $n\left(\mathrm{\omega }\right)$, where $\mathrm{\omega }$ is the angular frequency, is said to possess anomalous dispersion when

Two thin convex lenses $L_1$ and $L_2$ with focal lengths $1 \mathrm{cm}$ and $2 \mathrm{cm}$ respectively are separated by a distance of $4 \mathrm{cm}$ along their axis. An object is placed at a distance of $1.5 \mathrm{cm}$ before the first lens. The ratio of the final image size to the object size is

The focal length in the air of a thin lens made of glass of refractive index $1.5$ is $l$. When immersed in water (refractive index $=\frac{4}{3}$), its focal length becomes

A ray of light strikes a glass plate at an angle of $60°$. If the reflected and refracted rays are perpendicular to each other, the refractive index of glass is

A light ray from air is incident at one end of a glass fibre of refractive index $1.5$ making an incidence angle of $60°$ on the lateral surface, so that it undergoes a total internal reflection. How much time would it take to traverse the straight fibre of length $2 \mathrm{km}$?

A lens of refractive index $\mu$ becomes a lens of focal length $f^{\text{'}}$ when immersed in a liquid of refractive index ${\mu }^{\text{'}}$. If the focal length of the lens in air is $f$, then $f^{\text{'}}$ is