Priyanka B Solutions for Chapter: The Human Eye and Colourful World, Exercise 1: Assignment-1

State in brief the functions of following parts of the human eye:   

Ciliary muscles

State in brief the functions of following parts of human eye:

Pupil

What are the causes of the following defects of vision and how can they be corrected?

Presbyopia

Write the function of the following part of human eye:

Iris

Write the function of the following part of human eye:

Crystalline lens 

Write the function of the following part of human eye:

Ciliary muscles.

The far point of a myopic person is $150 \mathrm{cm}$ in front of the eye. Calculate the focal length and power of a lens required to enable him to see distant objects clearly.

Describe with a ray diagram how a person with myopia can be helped by spectacles.