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  Gravitation class 9 Notes, Solved Numerical and Work sheet PDF  Introduction: What is Gravitation? •              Gravitation is a natural phenomenon by which every object in the universe attracts every other object. •              This attractive force is called the gravitational force . •              It acts along the line joining the centers of the two objects.   Key Points 1.           Gravitation is a universal force – it acts between any two objects, whether big or small, near or far. –             Example: •              Earth attracts an apple (falls down). •        ...

  Human Eye and Colorful World Class-10 Notes & Numerical Introduction:                                    The chapter 'The Human Eye and the Colourful World' deals with the structure and working of the human eye, defects of vision, and various optical phenomena in nature. It connects physics with biology and explains how we perceive the world around us in colour. Structure of the Human Eye:                          The human eye is a spherical organ (about 2.5 cm in diameter) that acts as a natural optical device. It works like a camera – it receives light, focuses it, and forms an image on the retina. Main Parts of the Human Eye: 1) Cornea Transparent, curved front surface of the eye.  Allows light to enter the eye. Provides most of the refraction (bending of light rays).  Helps in...