Physics
Convex mirrors are used as a rear view mirror in motor cycles because

It forms smaller image as compared with object
It forms real image
It forms erect (upright) image
All of these

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Physics
In total internal reflection, the light travel from

Denser to rarer medium and it occurs with loss of intensity
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

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