Umakant Kondapure, Collin Fernandes, Nipun Bhatia, Vikram Bathula and, Ketki Deshpande Solutions for Chapter: Ray Optics, Exercise 3: Competitive Thinking

To avoid spherical aberration, quality reflecting telescopes use mirrors whose cross-sectional shapes are

An astronomical telescope has objective and eyepiece of focal length $40 \mathrm{cm}$ and $4 \mathrm{cm}$ respectively. To view an object $200 \mathrm{cm}$ away from the objective, the lenses must be separated by a distance

A telescope using an eyepiece of focal length $3 \mathrm{cm}$ has a magnification $10$ in normal adjustment. If the telescope is now used to view an object placed at a distance of $180 \mathrm{cm}$ from the objective, the new length of the telescope is (assume the final image is at infinity).

The ratio of the diameter of the sun to the distance between the earth and the sun is approximately $0.009.$ The approximate diameter of the image of the sun formed by a concave spherical mirror of radius of curvature $0.4 \mathrm{m}$ is

Given a point source of light, which of the following can produce a parallel beam of light?

Match the corresponding entries of column$-1$ with column$-2$ [where $m$ is the magnification produced by the mirror] 

The image of an object, formed by a planoconvex lens at a distance of $8 \mathrm{m}$ behind the lens, is real and is one-third the size of the object. The wavelength of light inside the lens is $\frac{2}{3}$ times the wavelength in free space. The radius of the curved surface of the lens is

Three thin lenses are combined by placing them in contact with each other to get more magnification in an optical instrument. Each lens has a focal length of $3 \mathrm{cm}$. If the least distance of distinct vision is taken as $25 \mathrm{cm}$, the total magnification of the lens combination in normal adjustment is