NCERT Solutions for Class 10 Science Chapter 11: The Human Eye and Colourful World
NCERT Class 10 Science Chapter 11 describes the fine structure of the human eye. It does explain the reason behind the color of the sun during the time of sunrise and sunset. It explains the accommodation of the eye concept. Various defects that occur to the eye like refractive defects of vision which include hypermetropia, myopia, and presbyopia are discussed in NCERT Solutions. It describes the near point of the eye or the least distance of distinct vision. Topics included in this chapter are:
11.1 The Human eye (4 questions)
The topic discusses the importance of the Human Eye, its structure and how it functions. The human eye is one of the most valuable and sensitive sense organs. Of all the sense organs, the human eye is the most significant one as it enables us to see the beautiful, colourful world around us. The topic also explains the power of accommodation where it talks about eye lens.
11.2 Defects of Vision and their Correction
The topic talks about defects of vision and their correction. There are mainly three common refractive defects of the eye. These are myopia or near-sightedness, hypermetropia or far-sightedness and Presbyopia. These defects can be corrected by the use of suitable spherical lenses.
11.3 Refraction of Light Through a Prism
You have learnt how light gets refracted through a rectangular glass slab. For parallel refracting surfaces, as in a glass slab, the emergent ray is parallel to the incident ray. However, it is slightly displaced laterally. In this topic, you will get to learn how lights get refracted through a triangular glass prism by performing an activity.
11.4 Dispersion of White Light by a Glass Prism
You must have seen and appreciated the spectacular colours in a rainbow. In this topic, you will get to know how rainbow occurs by performing an activity related to the refraction of light through a prism. It will help you know the reason behind dispersion of white light by a glass prism.
11.5 Atmospheric Refraction
The topic discusses Atmospheric Refraction and how it is related to the twinkling of stars and advance sunrise and delayed sunset. The twinkling of a star is due to atmospheric refraction of starlight.
11.6 Scattering of Light
In the previous class, you have learnt about the scattering of light by colloidal particles. The path of a beam of light passing through a true solution is not visible. However, its path becomes visible through a colloidal solution where the size of the particles is relatively larger. The topic further discusses the Tyndall Effect, why the colour of the clear sky blue? And colour of the Sun at sunrise and sunset.