AP Class 10 Physical Science Chapter 7 Human Eye and Colourful World, discusses in detail the structure and function of the human eye. Learning this topic can be interesting.
Structure of Human Eye
- The front portion of the eye is sharply curved and is covered by a transparent protective membrane known as the ‘cornea’.
- A place filled with a liquid known as the aqueous humour, behind the cornea, consist of a crystalline lens that is responsible for the image formation.
- Between the lens and the aqueous humour, a muscular diaphragm known as the ‘iris’ that consist of a small hole in it called pupil is present. It is responsible for controlling the amount of light entering the eye.
Common Defects Of Vision
The three common defects of vision are:
- Myopia
- Hypermetropia
- Presbyopia
In the next section, let us discuss a few chapter questions to better understand the concepts explained in the chapter.
Chapter 7 Human Eye and Colourful World
- Explain the formation of rainbow.
Answer:
- A rainbow is the natural spectrum of sunlight that appears in the sky in the form of bows when the sun shines on raindrops.
- It is the combined result of reflection, refraction and dispersion of the sunlight from the water droplets.
- When sunlight enters the spherical raindrop, it is dispersed and refracted. The different colours of light, bent in different angles.
- When different colours of light fall into the inner surface of the drop, it reflects different colours of light internally.
- The different colours are again refracted when it comes outside the water droplet.
- The different colour waves of light, leaving out the water droplet, reach our eyes as a rainbow.
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