Physics
If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?

Plane
Concave
Cylindrical
Convex

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Physics
When a piece of pure silicon is doped with aluminium, then

The resistivity of the doped silicon piece will increase
The doped silicon piece will become n-type
The conductivity of the doped silicon piece will remain the same
The doped silicon piece will become p-type

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Physics
Energy in reflected light :

Becomes maximum for angle of incidence equal to 45°
Decreases with the increase in angle of incidence
Increases with the increase in angle
Does not depends on the angle of incidence

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