Physics
A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.

Refraction
Reflection
Total internal reflection
Diffraction

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Physics
A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

None of these
Decreasing the radius of the capillary tube
Increasing the radius of the capillary tube
Increasing the height of water in the vessel

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