Question

please answer the following questions.
very urgent please guys.
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Answer 1

Answer:

1. as you know critical angle depends on refractive index the refractive index in turn depends on the phase velocity of that particular light and phase velocities are different for different colour so critical angle is related to colour of light
2. it is because refractive index for glass air interface is greater than that of glass water interface
3. the reason why the air bubble shines in water is because of the total internal reflection the speed of light inside the air bubble is faster than in the water the reason why the air bubble appears to be like mirror is that the light gets reflected around the outside of the bubble
4. diamonds get their brilliance from three things reflection refraction and dispersion only a portion of a light hitting a diamond is reflected the rest travel through it As the light moves through th diamond it is scattered and fractured creating the sparkle that diamonds are know for
5. this is because of the extreme distance the photons have travelled and the light has dissipated or degraded since the time the light left the star then the atmosphere distorts the light making it degraded even more look above you you will still see twinkle twinkle little stars