In which medium is the speed of light the highest?

$A$ ray of light $XY$ is incident on a spherical mirror as shown in the diagram. Redraw the diagram and mark the normal,angle of incidence and angle of reflection.

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

$A$ ray of light is incident on a plane mirror normally. What are the angle of incidence and the angle of reflection?

$A$ $4.5 \, cm$ needle is placed $12 \, cm$ away from a convex mirror of focal length $15 \, cm$. Give the location of the image and the magnification. Describe what happens to the image as the needle is moved farther from the mirror.

What kind of image is formed when an object is placed between the principal focus $(F)$ and the optical center $(O)$ of a convex lens?