Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in Figure?

Where should an object be placed in front of a convex lens to form a real,inverted,and same size image?

The figure below shows an object $AB$ placed on the principal axis of a convex lens placed in air. $F_{1}$ and $F_{2}$ are the two foci of the lens. Copy the diagram.
$(i)$ Draw a ray of light starting from $B$ and passing through $O$. Show the same ray after refraction by the lens.
$(ii)$ Draw another ray from $B$ which passes through $F_{2}$ after refraction by the lens.
$(iii)$ Locate the final image formed.
$(iv)$ Is the image real or virtual?

Name the spherical mirror used as:
$(a)$ $1.$ Shaving mirror,
$2.$ Rear-view mirror in vehicles,
$3.$ Reflector in searchlights.
$(b)$ Write any three differences between a real and virtual image.

Where should an object be placed in front of a convex lens to obtain a real and inverted image of the same size as the object?

Does the magnification equation change depending on whether the lens is a concave lens or a convex lens?