*Define Rarer medium and denser medium
* How the light under goes refraction.
*write sign conventions
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*Define Rarer medium and denser medium
* How the light under goes refraction.
*write sign conventions
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Explanation:
Answer: We know that air is a rarer medium and water is a denser medium. When a ray of light goes from a rarer medium to a denser medium, it bends towards the normal. So, the light ray will bend towards the normal in the given case.
➪A medium in which the speed of light is more is known as Optically Rarer medium .
Air is optically rarer medium as compared to glass and water.
A medium in which speed of light is less is known as optically denser medium.
glass is optically denser medium as compared to air.
➪As light passes through medium its speed changes, it is only possible when either its wavelength or frequency changes
But change in frequency would mean change in source of light which you never observe, as light when refracting from medium do not appear as coming from new source and hence frequency will remain the same
Thus only possible reason for change in velocity is change in wavelength.
Thus for slight change in velocity of light i.e. slightly slower speed, we have slightly longer wavelength of light in the medium.
Once it comes out of the medium, wavelength again changes and restoring the speed of light.
➪Sign convention is a set of rules to set signs for image distance, object distance, focal length, etc for mathematical analysis of image formation. According to it: ... Distances measured along y-axis above the principal axis are positive and that measured along y-axis below the principal axis are negative.