In a plane mirror,the distance between the image and the mirror is the same as the distance between the object and the mirror.

The figure shows a ray of light as it travels from medium $A$ to medium $B$. The refractive index of medium $B$ relative to medium $A$ is:

What is the point,where the rays parallel to the principal axis meet after reflection,called?

$A$ ray of light $AB$ parallel to the principal axis is incident on a convex lens as shown in the figure. Copy the figure.
$(i)$ Draw the refracted ray.
$(ii)$ Name the point through which the refracted ray passes on the principal axis.

When a plane mirror is rotated through a certain angle,the reflected ray turns through twice as much and the size of the image

What is the lens placed near the eye in a compound microscope called?