PRACTICE QUESTIONS

A prism splits up a beam of white light into seven colours because _____ is different for different colour.

Twinkling of stars is due to

Ciliary muscles can change the focal length of eye lens. This phenomenon is responsible for

Electric nerve impulses from retina to brain are conveyed by

Short sightedness.

After tracing the path of a ray of light through a glass prism a student marked the angle of incidence $\left(\angle i\right)$, angle of refraction $\left(\angle r\right)$, angle of emergence $\left(\angle e\right)$ and angle of deviation $\left(\angle D\right)$ as shown in the diagram. The correctly marked angles are:

Study the following figure in which a student has marked the angle of incidence $\angle i$, angle of refraction $\angle r$, angle of emergence $\angle e$, angle of prism $\angle A$ and angle of deviation $\angle D$. The correctly marked angles are 

In the following diagram the correctly marked angles are: