Physics
A black body can absorb radiations of :

Higher wavelengths only
All wavelengths
Intermediate wavelengths only
Lower wavelengths only

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Physics
In total internal reflection, the light travel from

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

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