SCIENCE CLASS 10TH CHAPTER-HUMAN EYE AND COLOURFUL WORLD

 

SCIENCE CLASS 10TH CHAPTER-HUMAN EYE AND COLOURFUL WORLD FORMULA & IMPORTANT POINTS

Science Formulas

class 10th for chapter-Human eye and colourful world 

  • The ability of the eye to focus both near and distant objects by adjusting its focal length is called the power of accommodation of the eye.
  • The smallest distance at which the eye can see objects dearly without strain, is called the near point of the eye or the least distance of distinct vision. It is 25 cm for a normal eye.
  • The farthest point upto which the eye can see objects clearly is called the far point of the eye. It is infinity for a normal eye.
  • The splitting of white light into its component colours is called dispersion
  • The scattering of light by the colloidal particles of a medium due to which the path of the light becomes visible is known as Tyndall Effect.
  • There are three common refractive defects of vision.
  • Myopia or short sightedness.
  • Hypermetropia or long sightedness.
  • Presbyopia

Myopia or Short-Sightedness

A person with myopia can see nearby objects clearly but cannot see distant objects distinctly

Hypermetropia or Long-Sightedness

A person with hypermetropia can see distant objects clearly but cannot see nearby objects distinctly

Presbyopia or Old Sight

Presbyopia is due to decrease in power of accommodation with ageing.

Atmospheric Refraction

It can be defined as bending of light while going through various layers of air in the atmosphere.

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