Through which of the following points will a ray passing through the centre of curvature and reflected by a concave mirror pass?

$(a)$ State the laws of refraction.
$(b)$ $A$ ray of light enters from a medium $A$ into a slab made up of a transparent substance $B$ (as shown in the figure). The refractive indices of medium $A$ and $B$ are $2.42$ and $1.65$ respectively. Complete the path of the ray of light until it emerges out of the slab.

An incident ray falls normally on a glass slab. What is the angle of refraction (in $°$)?

$A$ child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size, and that of the legs smaller. What is the order of combinations for the magic mirror from the top?

In which medium is the speed of light the highest?

The power of a lens is $5$ dioptre. What is the focal length of the lens (in $m$)?