If the image formed by a mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a ray diagram to justify your answer. Where and why do we generally use this type of mirror?

Draw ray diagrams to show the formation of images when the object is placed in front of a concave mirror.

(i) between pole and focus point

(ii) between focus and centre of curvature

(iii) beyond centre of curvature.

Draw ray diagrams to show the formation of images when the object is placed in front of a convex mirror.

(i) at infinity

(ii) at any point between infinity and pole.

Why is the focal length of a convex mirror is positive?

The refractive index of diamond is $2.47$ and that of glass is $1.51$. How fast does light travel in glass as compared to diamond?