Explaination of Refraction
>>Refraction of light is the bending of a light ray.(From one medium to another medium.)
>>Light travels in straight line.When light passes through two different density of medium,its direction changes at the boundary of media.
>>Light ray travel any subtance,the subtansce is called a medium.
>>When a light rat travels two different medium,its speed changes. The change in speed ( light ray) causes it to change its direction.
>>Law of Refraction states that :
1.The incident ray,the refraction ray and the normal at the point of incident all the three are in the same plane.
2.The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant. ( This is known as SNELL's LAW)
SNELL's LAW :
Diagram
>>The incident ray is perpendicular ( 90° )to the surface.
>>The ray passes the surface without being refracted.
>>The incident ray hits the boundary.
>>The incident ray slows down after hits the boundary and bends towards the normal.
Phenomenon Due to Refraction of Light
\>>Through the eye to see the fish,the fish appears closer to the image than actual position of fish.
>>If the fish look to the eye,the eye appears nearer than the actual position of eye.
>>The straw look bent when it immesed into the water.
>>It is because the light ray from the straw was refracted away as they normal in air.
>>Rainbow is appear after or during rain.
>> It is because the water droplets in the air was refracted the white sunlight,then the rainbow will be occur in the sky!
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