Advantages Of Refraction
Light is a type of electromagnetic radiation which is made of photons travelling at the speed of light in waves (3.00 x 10^8m/s).
When a ray of light hits the boundary of one see through medium to another, refraction occurs. Refraction is the bending of light due to change of the speed as light crosses the medium Eg. When a light ray travels from in the material air to the material glass. The speed of light and the angle of the incident ray contributes to the angle which it is refracted. Optical density meaning the density of a material which affects the speed of light measured using the index of refraction value, causing the angle which the light will bend. The index of refraction is represented symbol “n” which is used to express the number of times slower the light travels in a specific
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The above image shows the difference in magnification of an image with a short eye lens focal length compared with a long eye lens focal length. This can be calculated with the equation m= -di/do = hi/ho. Where di is the distance from the image from the eye lens and the do is the distance of the object to the lens. Hi is the height of the image while the ho is the height of the image. By using a negative di we can see that the final image produced will be upside down.
Some advantages to the using refracting telescopes is that the mirrors in the refracting telescopes are more resistant to getting misaligned than compared to reflecting telescopes. Another advantage is the lens inside the telescope rarely need cleaning due to the lens being closed from the outside by the tube. This blocks the air currents and atmosphere that may affect the final image produced.
A large disadvantage for refracting telescopes is an effect called chromatic aberration which is distortion of colours which creates a rainbow “halo” border around the image, this is due to the colours with longer wavelength (red colours) refract less than colours of light with shorter wavelengths such as blue
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