"Endoscope" used by the doctors for examining the inside of patient's stomach, works on the principle of

The mirror used by a dentist to examine the teeth of patients is

Which one among the following is used in a simple microscope ?

Which one of the following phenomenon is used in optical fibres?

Light waves are incident on an air-glass boundary. Some of the light waves are reflected and some are refracted in the glass. Which one of the following properties is the same for the incident wave a…

Which one of the following colours of white light is least deviated by the glass prism?