Curved Mirror

An object is placed in front of a convex mirror. Which one of the following statements is correct?

A short linear object $\mathrm{O}$ is placed on the principal axis of convex mirror of focal length $f$ as shown in the figure. The ratio of transverse magnification to longitudinal magnification is :

In a motor car, spherical mirrors are utilised at two different places,
(i) the head light and
(ii) rear view mirror. What type of mirrors are used?

If a concave mirror of focal length $10 \mathrm{cm}$ is immersed in water, its focal length will

A convex mirror has a focal length $f.$ A real object is placed at a distance $f$ in front of it from the pole, then it produces an image at-

A concave mirror is placed on a horizontal table with its axis vertically upwards. Let $O$ be the pole of the mirror and $C$ be the centre of curvature. A point object placed at $C$, forms a real image at $C$. If the mirror is now filled with water, the image will be

A concave mirror of focal length $15 \mathrm{cm}$, forms an image having twice the linear dimensions of the object. The position of the object, when the image is virtual, will be