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NCERT Solutions for Class 10 Science Chapter 11 The Human Eye and the Colourful World are provided in the article below. It covers all the important definitions, concepts, and methodologies that will be really beneficial for the students. The important topics that are included in this chapter are:
- Functioning of a lens in the human eye
- Defects of vision and their corrections
- Applications of spherical mirrors and lenses
Expected no. of Questions: 3-4 questions of around 6 marks.
Download PDF: NCERT Solutions for Class 10 Science Chapter 11 The Human Eye and the Colourful World
NCERT Solutions for Class 10 Science Chapter 11
Class 10 Science Chapter 11 The Human Eye and the Colourful World: Important Topics
The Human Eye acts as a natural optical instrument providing us the ability to detect light and see the beautiful world around us. The human eye has a significant similarity to a camera due to the presence of a screen system and a lens. Various parts of the eye work collectively leading to our normal visual functioning. The ability to differentiate between colors and depth is made possible through the eyes. Although delicate and small, the eyes are an extremely complex organ. Some of the important topics that are covered in this chapter are:
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Functioning of a Lens in the Human Eye
The lens changes the focal distance of the eye by changing its shape. In other words, it focuses on the light rays that pass through it and onto the retina so that it can create clear images of objects that are positioned at various distances. It also works together with the cornea to refract or bend, light.
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Defects of Vision and their Corrections
Defects in the eye take place as a result of many reasons. The vision also decreases due to the growing age, and when the focal length alters, the vision also alters. We already know that cataract is a common defect seen in the eye. There are mainly three common refractive defects of vision, which are (i) myopia or near-sightedness (ii) Hypermetropia or farsightedness (iii) Presbyopia.
| (i) Myopia: It is commonly known as near-sightedness, where the person can see the objects nearby, but cannot see distant objects clearly. Symptoms:
Correction: It assists in focusing the image onto the retina when a concave lens of suitable power is used. (ii) Hypermetropia or farsightedness: It is commonly known as far-sightedness, where the person can see objects at distance but cannot see nearby objects clearly. Symptoms:
Correction: Using spectacles with a converging lens imparts additional focussing power helping in forming the image on the retina. (iii) Presbyopia: It is the condition where people have difficulties viewing nearby objects clearly without the assistance of corrective eyeglasses. Symptoms:
Correction: This condition can be corrected by using proper eyeglasses or contact lenses. Minor surgery also helps in restoring the vision with better clarity. |
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