Fill in the following blank with a suitable word:

A ray of light which is parallel to the' principal axis of a _______, appears to be coming from focus after reflection from the mirror.

What kind of mirrors are used in shopping centres to watch the activities of the customers?

A ray of light going towards the of a convex mirror becomes parallel to the principal axis after reflection from the mirror. Draw a labelled diagram to represent this situation.

Why does a driver prefer to use a convex mirror as a rear-view mirror in a vehicle ?

Why can you not use a concave mirror as a rear-view mirror in vehicles?