NCERT Solutions for Chapter: Ray Optics and Optical Instruments, Exercise 1: MCQ

Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object looks distorted because

A rectangular block of glass $\mathrm{ABCD}$ has a refractive index $1.6$. A pin is placed midway on the face $\mathrm{AB}$ (Figure). When observed from the face $\mathrm{AD}$. the pin shall

Between the primary and secondary rainbows, there is a dark band known as Alexander dark band. This is because

A magnifying glass is used, as the object to be viewed can be brought closer to the eye than the normal near point. This results in

An astronomical refractive telescope has an objective of focal length $20 \mathrm{m}$ and an eyepiece of focal length $2 \mathrm{cm}$.