Images Formed by a Concave Mirror

A convex mirror has a focal length of $18 \mathrm{cm}$. The image of an object kept in front of the mirror is half the height of the object. What is the distance of the object from the mirror?

A $10 \mathrm{cm}$ long stick is kept in front of a concave mirror, having a focal length of $10 \mathrm{cm}$ in such a way that the end of the stick closest to the pole is at a distance of $20 \mathrm{cm}$. What will be the length of the image?

Three mirrors are created from a single sphere. Which of the following - pole, the centre of curvature, the radius of curvature, principal axis - will be common to them and which will not be common?

Why does obtaining the image of the sun on a paper with the help of a concave mirror burn the paper?

Describe the positions of the source of light with respect to a concave mirror in
1. Torchlight  
2. Projector lamp 
3. Floodlight

Why are concave mirrors used in solar devices?

Why are the mirrors fitted on the outside of cars convex?