Physics
In total internal reflection, the light travel from

Denser to rarer medium and it occurs with no loss of intensity
Rarer to denser medium and it occurs with loss of intensity
Denser to rarer medium and it occurs with loss of intensity
Rarer to denser medium and it occurs with no loss of intensity

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Physics
Rainbow is due to

ionisation of water deposits
refraction and reflection of sunlight by water droplets
absorption of sunlight in minute water droplets
diffusion of sunlight through water droplets

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