Embibe Experts Solutions for Chapter: The Human Eye and the Colourful World, Exercise 1: CBSE-2019

Write the function of crystalline lens of human eye.

Write the function of ciliary muscles of human eye.

Why does the sun appear reddish early in the morning ? Will this phenomenon be observed by an astronaut on the Moon ? Give reason to justify your answer. 

When do we consider a person to be myopic or hypermetropic? List two causes of hypermetropia. Explain using ray diagrams how the defect associated with hypermetropic eye can be corrected.

A student traces the path of a ray of light through a glass prism as shown in the diagram, but leaves it incomplete and unlabelled. Redraw and complete the diagram. Also, label on it $\angle i, \angle e, \angle r$ and $\angle D$.

Why is Tyndall effect shown by colloidal particles? State four instances of observing the Tyndall effect.

Draw a labelled diagram to show (i) reddish appearance of the sun at the sunrise or the sunset and (ii) white appearance of the sun at noon when it is overhead.

Differentiate between a glass slab and a glass prism.