A man standing in front of a special mirror finds his image having a very small head, a fat body and legs of normal size. What is the shape of: $(a)$ Top part of the mirror? $(b)$ Middle part of the mirror? $(c)$ Bottom part of the mirror? Give reasons for your choice.

In which of the following,the image of an object placed at infinity will be highly diminished and point-sized?

When an object is placed $20 \text{ cm}$ from a concave mirror, a real image magnified three times is formed. Find:
$(a)$ The focal length of the mirror.
$(b)$ Where must the object be placed to give a virtual image three times the height of the object (in $\text{ cm}$)?

Study the given ray diagrams and select the correct statement from the following:
$(A)$ Device $X$ is a concave mirror and device $Y$ is a convex lens, whose focal lengths are $20 \text{ cm}$ and $25 \text{ cm}$ respectively.
$(B)$ Device $X$ is a convex lens and device $Y$ is a concave mirror, whose focal lengths are $10 \text{ cm}$ and $25 \text{ cm}$ respectively.
$(C)$ Device $X$ is a concave lens and device $Y$ is a convex mirror, whose focal lengths are $20 \text{ cm}$ and $25 \text{ cm}$ respectively.
$(D)$ Device $X$ is a convex lens and device $Y$ is a concave mirror, whose focal lengths are $20 \text{ cm}$ and $25 \text{ cm}$ respectively.

The image shows the path of light as it travels from one medium to another.
$9$. Based on the refraction observed, which pair of media could represent Medium $1$ and Medium $2$?

	Medium $1$	Medium $2$
$A$.	Water	Kerosene
$B$.	Kerosene	Diamond
$C$.	Flint glass	Water
$D$.	Kerosene	Flint glass

$10$. The power of a lens $(P)$ is calculated by the formula, $P = \frac{1}{f}$, where $f$ is the focal length of the lens in meters. A lens has a focal length of $-0.25 \ m$. Is it a convex lens or a concave lens? Explain your answer.

A convex mirror and a convex lens always form a virtual image. [True/False]