Exercise - 1

A point object is kept in front of a plane mirror. The plane mirror is doing $\mathrm{SHM}$ of amplitude $2 \mathrm{cm}$. The plane mirror moves along the $x$-axis and $x$- axis is normal to the mirror. The amplitude of the mirror is such that the object is always in front of the mirror. The amplitude of $\mathrm{SHM}$ of the image is

A small fish, $4\mathrm{cm}$ below the surface of a lake, is viewed through a thin converging lens of focal length $30\mathrm{cm}$ held $2\mathrm{cm}$ above the water surface. Refractive index of water is $1.33 .$ The image of the fish from the lens is at a distance of

A simple microscope has a focal length of $5 \mathrm{cm}$. The magnification at the least distance of distinct vision is-

A Galileo telescope has an objective of focal length $100 \mathrm{cm}$ and magnifying power $50$. The distance between the two lenses in normal adjustment will be

The convex lens is used in-

The magnifying power of a simple microscope can be increased if an eyepiece of:

The focal length of the objective of the microscope is

An astronomical telescope has an eyepiece of focal-length $5 \mathrm{cm}$. If the angular magnification in normal adjustment is $10,$ when final image is at least distance of distinct vision $\left(25 \mathrm{cm}\right)$ from eye piece, then angular magnification will be :