Physics
Which one of the following is used for sun glasses ?

Flint glass
Pyrex glass
Crooks glass
Crystal glass

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Physics
A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

It will fall down at the same place where the string breaks
The ball will travel towards the center of the circle and fall down
It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down
None of these

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