explain why line AC is bending and AD is not bending???
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The reason is quite simple. We know that light bends either towards or away the normal. But, there is a certain criteria where the light ray doesn't bend and goes without refraction.
Criteria: The angle of incidence should be 0° or there is a normal incidence.
As we know, sin i = n sin r [from Snell’s law]
=> sin 0° = n sir r
=> sir r = 0
=> r = arcsin(0) = 0°.
So, there is no refraction.
Therefore, the ray doesn't deviate as it passes through O but deviates in case of pacing through C.
More:
- Light always gets reflected even when it refracts.
- Again, a light doesn't refract even when it passes from one optical medium to another one. This is because, the angle of incidence ≤ the critical angle. It only gets reflected in the medium. This is called as total internal reflection of light.
- Light travels with more speed in hotter objects than cool objects. [That means, more in water vapour and less in ice cubes.]
- Silver is the best reflector of light.
Diamonds when are mined have no lustre. But after treating it becomes a shiny object. Guess why? (Hint in attachment.)
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