Physics
Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit

radio waves
X-rays
ultraviolet light
visible light

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Physics
In total internal reflection, the light travel from

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

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