Lakhmir Singh and Manjit Kaur Solutions for Chapter: Reflection of Light, Exercise 20: Short Answer Type Questions

A concave mirror produces three times enlarged virtual image of an object placed at $10 \mathrm{cm}$ in front of it. Calculate the radius of curvature of the mirror.

A bright object $50 \mathrm{mm}$ high stands on the axis of a concave mirror of focal length $100 \mathrm{mm}$ and at a distance of $300 \mathrm{mm}$ from the concave mirror. How big will the image be?

How far should an object be placed from the pole of a converging mirror of focal length $20 \mathrm{cm}$ to form a real image of the size exactly $\frac{1}{4}$ th the size of the object?

When an object is placed at a distance of $50 \mathrm{cm}$ from a concave spherical mirror, the magnification produced is $-\frac{1}{2}$. Where should the object be placed to get a magnification of $-\frac{1}{5}$?

An object is placed $20 \mathrm{cm}$ in front of a concave mirror of focal length $12 \mathrm{cm}$. Find the nature and position of the image formed in each case. 

An object is placed $4 \mathrm{cm}$, in front of a concave mirror of focal length $12 \mathrm{cm}$. Find the nature and position of the image formed in the case. 

A concave mirror produces a real image $1 \mathrm{cm}$ tall of an object $2.5 \mathrm{mm}$ tall placed $5 \mathrm{cm}$ from the mirror. Find the position of the image and the focal length of the mirror.

A man holds a spherical shaving mirror of radius of curvature $60 \mathrm{cm}$, and focal length $30 \mathrm{cm}$, at a distance of $15 \mathrm{cm}$, from his nose. Find the position of image, and calculate the magnification.