Physics
Convex mirror is generally used in ________

Rear view mirror
Reflector for head light
Solar cookers
Opthalmoscope

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Physics
Rainbows are produced when sunlight :

Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.
None of the given statements is correct.

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Physics
The blue colour of water in the sea is due to

Reflection of blue sky by sea water
Absorption of other colours except blue by water molecules
Reflection of blue light by impurities in sea water
Scattering of blue light by water molecules

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