Physics
In total internal reflection, the light travel from

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

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Physics
What is a neuron ?

Basic unit of nervous system
The anti-particle of neutron
Particle released during radioactivity
Basic unit of energy

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