Physics

Primary Colors, Secondary colors and Complimentary Colors

May 21, 2013

When a beam of white light is passed through a prism, white light splits up into different colours. Consequently a coloured pattern is obtained on the screen. This splitting of white light into its constituent colours is called dispersion of light. The coloured patent obtained on the screen is...

Human Eye & Eye Defects

May 21, 2013

Our eyeball is nearly spherical with white outer layer called the sclera. Here is a short description of how our eye works. Working of Human Eye The light enters the eye through a curved transparent tissue called Cornea. In humans, the refractive power of the cornea is approximately 43...

Near Point increasing with age

May 21, 2013

The points between which the eye can see distinctly are called far point and near point. The far point is normally without limit (infinity) and near point depends on the accommodation of the crystalline lens. When we move a pencil slowly towards our nose. At some points, we observe...

Twinkling of Stars and Mirage

May 21, 2013

Heat energy radiated by the earth changes the density of the atmospheric layers continuously. This changing density of the air layers near the ground affects its refractive index. Due to the refraction of light rays from the star, path of these rays goes on varying. Hence the eye some...

Lens Formula & Power of the Lens

May 21, 2013

The relationship between the object distance (u), the image distance (v) and the focal length (f) of the lens is called lens formula. From the above formula, Focal length of a lens is obtained as follows: The power of a lens is the measure of its ability to produce...

Real Images and Virtual Images

May 21, 2013

The image formed by the actual intersection of refracted rays through a lens is called the real image. The real images can be caught on the screen and they are inverted. The images that appear without actual intersection of the refracted rays are called virtual images. Convex Lens As...

Lenses

May 21, 2013

A lens is a thin piece of a transparent material bounded by two spherical surfaces or by one spherical and other plane surface. The width or diameter of a lens is called the aperture of the lens. The geometric centre of a lens is known as its optic centre...

Total Internal Reflection

May 21, 2013

When a ray of light passes from an optically denser medium into a rarer medium; the refracted ray is bent away from the normal. A ray of light incident normal to the surface passes without any deviation. As the angle of incidence increases, the angle of refraction also increases...

Refraction of light

May 21, 2013

When we place a pencil in a beaker containing water, we observe that the pencil appears to be bent at the point where it just enters water. Again, when we put a coin in the bottom of an empty cup and position our head so that the coin is...

Humidity and Relative Humidity

May 21, 2013

Humidity is the amount of water vapour present in atmosphere. The amount of water vapour in atmosphere changes with time and weather. The air containing water vapour is called humid air. The amount of vapour present per unit volume of air is called the humidity of air. Humidity is...

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