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why light refraction by the rain drop is red colour at bottom but blue colour on top . However we can see the rainbow is that :the red colour is at top and the blue is at bottom?
Light refraction is the bending of light as it passes through different mediums, such as air, water, or glass. It is important because it allows us to see objects that are not directly in our line of sight and is the basis for many optical devices, such as lenses and prisms.
This phenomenon is due to the fact that red light has a longer wavelength and is refracted less than blue light. This causes red light to bend at a smaller angle, making it appear on the outer edge of a rainbow, while blue light bends at a larger angle and appears on the inner edge.
The angle of refraction is determined by the wavelength of light, with longer wavelengths (such as red light) refracting less than shorter wavelengths (such as blue light). This explains why the colors of a rainbow appear in a specific order, with red on the outside and violet on the inside.
Yes, light refraction can be reversed under certain conditions. This is known as total internal reflection and occurs when light travels from a higher refractive index medium (such as water) to a lower refractive index medium (such as air) at a steep angle. In this case, the light reflects back into the medium instead of passing through it.
Light refraction can also be affected by the temperature and density of the medium it is passing through. As temperature and density increase, the speed of light decreases and the angle of refraction changes. This is why objects may appear distorted when viewed through hot air above a fire or over a heated surface.