Human eye and colourful world

Human Eye It is one of the sensitive sense organs present in living organisms. It acts like a Camera. The image is formed on light sensitive screen known as Retina. Thin membrane through which light enters the eye is known as Cornea. The eyeball is spherical in shape. Presence of the crystalline lens helps in adjusting objects at […]

Light-Reflection and Refraction

Laws of Reflection The angle of incidence is equal to angle of reflection Incident ray, reflected ray and normal all lie in the same plane. Spherical Mirrors Most common type of curved mirrors are spherical mirrors. Mirrors in which reflecting surface are spherical in shape, is known as spherical mirrors. Reflecting surface of a mirror […]

Sources of energy

The largest source of energy on land is sunlight. There are different purposes for which energy is needed such as for food, for lightning, transport, running machines etc. A good source of energy should be- Cheap and easily available. Safe in handling and use. Do not cause any environment pollution. Easy to store and transport. […]

Magnetic effect of electric current

ny substance that attracts iron and iron like objects is defined as magnet. When a wire carries an electric current, it behaves as a magnet. Properties of Magnet Every magnet has north and south poles. Same poles repel each other and unlike poles attract each other. A freely suspended magnet will align itself in north […]

Electricity

Charge Protons and electrons possess some charge. Proton has positive charge. Electron has negative charge. Neutron does not possess any charge. Like charges repel each other and unlike charges attract each other. Conductors and Insulators Conductors are those materials in which electrons can move freely. All metals are conductors. Insulators do not have any free […]