Physics
A drop of liquid assumes spherical shape because:

A sphere has the least surface area for a given volume
Intermolecular forces are strong in liquids
A sphere has the largest surface area for a given volume
Inter molecular forces are weak in liquids

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Physics
In total internal reflection, the light travel from

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

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