fourth grade science on light

Light is an external cause responsible for sensation of visio..

Light is a form of energy and can be transformed into other forms of energy. You would have observed the path of 'a beam of light' inside a room. This beam is nothing but the scattered light produced by the dust particles. Beam of light becomes invisible if ..

Light is a form of energy and can be transformed into other forms of energy. You would have observed the path of 'a beam of light' inside a roo..

When a ray of light hits a surface, it bounces off or reflects and then reaches our eyes. This phenomenon by which a ray of light changes the direction of propagation when it strikes a boundary between different media through which it cannot pass is described as the reflection ..

Let us now see what happens when a ray of light is incident on the boundary separating the two media having different densities. A part of the light gets reflected and rest of the light changes its direction as it enters the second medium. The diagram shows how t..

Introduction - In the previous chapter we have seen how light gets reflected when it is incident on a surface. Now let us see what happens when a ray of light travelling in one medium enters another medium of different optical density. It is a matter of common experience that a ..

Some reactions take place only in light and do not take place in dark e.g. photosynthesis in green plants or reaction between H2 and Cl2 to form H..

The deviation in the path of light when it passes from one medium to another medium of different density is called refractio..

Some reactions take place only in light and do not take place in dark e.g. photosynthesis in green plants or reaction between H 2 and Cl 2 to form HCl..

Low light intensity lowers the rate of photosynthesis. As the intensity is increased the rate also increases. However, after reaching an intensity of 10,000 lux (lux is the unit for measuring light intensity) there is no effect on the rate. Very high intensity may, in fact, slo..