Physics
A concave lens always forms

A virtual image
An image type which depends on object characteristics
A real image
An image type which depends on lens curvature

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Physics
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
at a place in a valley below sea level
at the top of Mt. Everest
at sea level

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