Two big mirrors $A$ and $B$ are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror $A$ goes on increasing, but that in mirror $B$ remains the same.

For which type of mirror will the image always be erect,regardless of the distance at which the object is placed?

The images show four ray diagrams of images formed by concave mirrors. $P$ is the pole of the mirror. $F$ is the focus. $C$ is the centre of curvature. $AB$ is the object and $A'B'$ is the image.
$1$. Which of these can be concluded from diagram $1$?
$A$. Image is formed at the focus.
$B$. Size of the image is equal to the size of the object.
$C$. Distance between pole and centre of curvature is twice the focal length.
$D$. Distance between the image and focus is half the distance between the object and focus.
$2$. Which diagram shows a real, inverted and enlarged image formed by the mirror?
$A$. Diagram $1$
$B$. Diagram $2$
$C$. Diagram $3$
$D$. Diagram $4$
$3$. In which condition does a concave mirror produce a virtual image?
$A$. When object is located within the focal length
$B$. When object is located at the centre of curvature
$C$. When object is located in between infinity and the centre of curvature
$D$. When object is located in between the centre of curvature and the focus
$4$. Solar cookers contain a concave mirror. How does the concave mirror help in heating the food? Indicate 'Yes' or 'No' for each statement.

How does the concave mirror heat the food?	Yes/No
Sun’s rays are absorbed by the mirror.	Yes/No
Sun’s rays reflected by the mirror converge at a point.	Yes/No
Sun’s rays diverge out when reflected by the mirror.	Yes/No

No matter how far you stand from a mirror,your image appears erect. The mirror is likely to be

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 magnification $m$ produced by a spherical mirror and a spherical lens is $+0.8$. Identify the nature of the mirror and the lens.