Physics
The wavelength of a wave is the distance between

Trough and Trough
Both B & C
Crest and Trough
Crest and Crest

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Physics
In total internal reflection, the light travel from

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

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