NCERT Class 10 Science Chapter 10 PDF: The Human Eye and the Colourful World – Download Now

Chapter 10 of Class 10 Science, The Human Eye and the Colourful World, explains how the eye functions and introduces the scientific reasons behind everyday phenomena like the blue sky, rainbow, and red sunsets. It builds upon the concepts of light studied in the previous chapter and explores how vision works, what defects of vision are, and how atmospheric refraction creates beautiful patterns in nature. This chapter is extremely scoring in board exams and contains both theory-based and application-based questions.

I chose to write about this chapter because when I was preparing for the Class 10 board exam, this was one of the most relatable yet misunderstood topics among students. Most of us know we see things using our eyes, but not how the eye works internally or why we see mirages and rainbows. Many students also get confused between myopia and hypermetropia. That’s why having access to the NCERT PDF is essential. It explains the concepts in simple steps and includes neat diagrams that help with both understanding and diagram-based questions in exams. If you’re serious about scoring well, reading this chapter thoroughly from the NCERT book is a must.

Important Topics Covered in Chapter 10

Structure and Functioning of the Human Eye

Cornea, iris, pupil, retina, and optic nerve
Power of accommodation: How the eye adjusts to focus near and distant objects
Near point, far point, and least distance of distinct vision

Defects of Vision and Their Correction

Myopia (short-sightedness): causes, ray diagram, correction using concave lens
Hypermetropia (long-sightedness): causes, ray diagram, correction using convex lens
Presbyopia: common in old age, use of bifocal lenses

Refraction of Light Through the Atmosphere

Why stars appear to twinkle
Why the sun appears reddish at sunrise and sunset
Advanced sunrise and delayed sunset

Dispersion of Light

How white light splits into seven colours
Prism experiment
Rainbow formation: conditions required and diagram

Scattering of Light

Why the sky is blue
Why clouds appear white
Application in nature and technology (e.g., fog lights use yellow light)

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Click here to download NCERT Class 10 Science Chapter 10: The Human Eye and the Colourful World PDF

NCERT Class 11 Business Studies Chapter 11 PDF (Hindi): अंतर्राष्ट्रीय व्यापार

Chapter 11 of Class 11 Business Studies (Hindi Medium), titled अंतर्राष्ट्रीय व्यापार, helps students understand how countries buy and sell goods and services across borders. This chapter explains important concepts like imports, exports, foreign currency, global markets, and the role of trade regulations. It highlights how products made in one country reach people in another country and how global trade builds economic relationships between nations.

The mobile phone we use may be assembled in one country, have parts manufactured in another, and run on software developed somewhere else. Clothes, electronics, medicines, and even food items available in Indian markets often come from different countries, while products like tea, spices, textiles, and engineering goods are exported from India to the world.

Understanding this chapter helps students realise how interconnected global markets are and how trade influences prices, availability of goods, employment, and international relations. It builds awareness of how businesses operate beyond national borders and encourages commerce students to think from a global perspective.

Overview of Chapter 11: अंतर्राष्ट्रीय व्यापार

International trade refers to the exchange of goods and services between different countries. It plays a major role in strengthening economic ties, maintaining foreign exchange reserves, and improving the standard of living of people.

Types of International Trade

Type of Trade	Meaning
Import (आयात)	Buying goods and services from other countries
Export (निर्यात)	Selling goods and services to other countries
Entrepot Trade	Buying goods from one country and selling to another

Why Countries Engage in International Trade

Countries trade with each other for various reasons, such as:

Unequal availability of natural resources
Differences in climate and production ability
Cost advantages and specialization
Better quality and variety of goods
Access to new markets

Benefits of International Trade

Provides access to global products and technology
Encourages large-scale production
Strengthens diplomatic relations between countries
Generates foreign exchange earnings
Supports economic growth and employment

Restrictions and Regulations in International Trade

International trade is regulated through policies to protect domestic industries and maintain balance. Some common trade barriers include:

Tariffs (custom duties)
Quotas (limits on imports)
Licensing requirements
Export regulations
Anti-dumping measures

Role of International Organizations

Certain organisations support fair and regulated international trade, such as:

WTO (World Trade Organization)
IMF (International Monetary Fund)
World Bank
They help in resolving trade disputes, promoting cooperation, and offering financial support.