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

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Physics
An integrated circuit is more advantages than a coventional circuit because

If a part of the integrated circuit fails the entire circuit is simply replaced
They make the electric equipments more reliable and easier for servicing
All listed here
A faulty part of a conventional circuit may be difficult to locate and repair

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Physics
Lightning is produced when

Clouds strike against impurities in air and the friction burns up these impurities
Similar charges of electricity rush towards each other and then get repelled
Water vapour produces electricity in the clouds
Strong opposite charges in different clouds break down the resistance offered by the intervening air

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