Embibe Experts Solutions for Chapter: The Human Eye and the Colourful World, Exercise 1: assam board-2018

What are the defects of vision? A person needs a lens of power, $-5.5 \mathrm{D}$ for correcting his distant vision. For correcting his near vision, he needs a lens of power, $+1.5 \mathrm{D}$. What is the focal length of the lens required for correcting distant vision?

The least distance of distinct vision for a young adult with normal vision is about

What is meant by power of accommodation of eye?

Draw the ray diagram to show how hypermetropia is corrected.Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is $1 \mathrm{m}$. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is $0.25 \mathrm{m}$.

Why does the sun appear reddish early in the morning? Draw the ray diagram of an arrangement for observing scattering of light in colloidal solution.

Why do stars twinkle?

What do you mean by Dispersion of white light? Draw the ray diagram to show the dispersion of white light when passes through a prism.

What is Presbyopia? Draw the ray diagram to show how Myopia is corrected.