Assertion: By roughening the surface of a glass sheet its transparency can be reduced.
Reason: Glass sheet with rough surface absorbs more light.

A: Transperency of glass decreases if its surface becomes rough. R : Glass of rough surface absorbs more light.

Friction can be reduced by making a surface rough. true/ false

A ray of light grazes the top surface of a glass slab. Can it be traced along the opposite bottom surface of the glass slab?

Ordinary light is incident on the upper surface of a glass slab at theh polarizing angle. Then

Assertion : A ray of light entering from glass to air suffers change in frequency. Reason : Velocity of light in glass is more than that ni air.

Assertion : If the light from an ordinary source passes through a polaroid sheet, its intensity is reduced by half. Reason : The electric vectors associated with the light wave along the direction of the aligned molecules get absorbed by polaroid.

Assertion : If the light from an ordinary source passes through a polaroid sheet, its intensity is reduced by half. Reason : The electric vectors associated with the light wave along the direction of the aligned molecules get absorbed by polaroid.