How Do Rainbows Form?

2017-06-19 10:18:55 UTC

Who does not like seeing the rainbows?

Rainbows combines rain and sunlight harmoniously. Sunlight has actually different colours that we don’t usually see.When a beam of sunlight comes down to Earth, the light is white.If the beams of sunlight enter the raindrop, we see some different colours, which are blue, red, yellow, orange, green, indigo and violet, due to reflection and the angle.The light exits the raindrop in one colour, depending on the angle it came in, so we see only one colour coming from each raindrop. Therefore, a lot of raindrops reveal a variety of colours.

Why does our eyesight deteriorate?

2017-06-19 10:37:11 UTC

The causes of diseases such as astigmatism, hypermetropia and miyopia have proved to be genetic.

On the other hand, light plays an important role in the deterioration of our eyes.

The thin cornea in our eyes collects and approximates the incoming beam. This is called miyopia. Because of miyopia disease, you can not see far distinction.

At the same time the the cornea removes the light coming to itself. This is called hypermetropia.Because of hypermetropia disease, you can not see close distinction.

It is on the retina that the light is converted into a neural signal that is ultimately interpreted by the brain as an image. The optic nerve carries these signals to the brain. Finally it functions like a cable that connects the video camera to the television screen. The deterioration of our vision is invariably the result of a problem with one of these structures.

Besides this, spending a lot of time with tv or pc affect our eye sight adversely. Because our eyes are exposed light.

Rainbows and eyesight by Johan Nayar

How Do Rainbows Form?

Why does our eyesight deteriorate?