Optics (Physics) Part-III

The back of your eye is lined with a layer known as the retina. The retina operates in a similar way to the film inside a traditional (non-digital) camera.

The middle part of the retina (known as the macula) takes care of your sharp vision. Your retina's nerve cells change light rays into electrical impulses and then sends them to the brain through the optic nerve.

The functioning of the human eye is similar to that of the photographic camera. The light rays travel into the cornea are refracted by the cornea and lens.

In a normal eye, the image formed are transmitted from the retina to the brain along the optic nerve, where data processing takes place (the image is perceived the right way up).

The functioning of the human eye is similar to that of the photographic camera. The light rays travel into the cornea are refracted by the cornea and lens.

In a normal eye, the image formed are transmitted from the retina to the brain along the optic nerve, where data processing takes place (the image is perceived the right way up).

In long-sightedness (Hypermetropia) the image of a nearby object is formed behind the retina. It results in close objects appearing blurry.

The condition occurs in case the eyeball is too short or the focal length of the eye lens has been increased. The long-sightedness is corrected by the convex lens.

The colour of an opaque object is the same as the colour of the light that is reflected by it. Opaque object doesn't pass the light through it. It absorbs part of incident light and reflects the other part.

The cathode ray tube (CRT), which is used in colour television uses three different phosphors which emit red, green and blue light respectively. They are packed together in stripes or clusters called "triads".

The cathode ray tube (CRT), which is used in colour television uses three different phosphors which emit red, green and blue light respectively. They are packed together in stripes or clusters called "triads".

Red, green and blue are referred to as the primary colours of light. Because we add them together to create a colour, we call them additive colors.

Cyan, Magenta and yellow are called the subtractive color because we create colour by using them to subtract colour from white light. If we add all 3 primary colours of light in equal proportions we obtain white colour light.

Black is not a primary colour. In painting red, yellow and blue are primary colours. But in terms of physics and light, primary colours are red, green and blue.