Physics
A simple microscope consists of :

A long focus concave lens
A short focus concave lens
A short focus convex lens
A long focus convex lens

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Physics
A cyclist leans inwards when he is negotiating a curve so that

No frictional force may be produced between the wheels and the axle
His weight may be reduced
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
He may increase his speed

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