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Showing posts from May, 2021

Refraction of Light

You must have heard of reflection of light. It's when a ray of light bounces back from a surface.  When a light ray hits a mirror, it bounces back with the same angle as the angle with which it hit the mirror. The angle of incidence is always equal to the angle of reflection But what if instead of a mirror, there is a transparent surface? In such cases, the light ray goes through the surface, and undergoes refraction.  What is refraction? Refraction is the bending of light when it goes from one medium to another. This happens because the speed of light changes across two different media. When a ray of light is perpendicular to the normal, it travels to the other medium without bending. The ray of light only bends when it goes obliquely from one medium to another. This bending of light depends on the medium through which light is travelling. Optical Density • Rarer medium:  The medium through which the speed of light is more is an optically rarer medium. • Denser medium: The medium...

Electricity

We use electricity everywhere.  When it gets dark, you turn the lights on, which run on electricity. You make your food in your microwave oven, which runs on electricity. You watch your favourite shows on your television, which runs on electricity as well. In fact, the very device you are using right now to read this blog requires electricity to function. Electricity is one of the most important inventions, and is very essential in today's world. BUT WHAT IS ELECTRICITY? Electricity is the set of physical phenomena related to the motion of matter that has a property of electric charge.  For example, when electrons flow in a circuit, they produce electricity/electric current. TYPES OF ELECTRICITY There are two types of electricity: • Static electricity :  It occurs when there is an imbalance between negative and positive charges in an object. This can be done by rubbing materials together which leads to the transfer of negative charge(electrons).  For example, wh...