Intensity of light from a candle is approximatcly cqual to one'candela'.

Define one light year.

When the intensity of a light source is increased.

Two polaroids are set in crossed positions.A third polaroid is placed between the two making an angle angle with the pass axis of the first polaroid. Write the expression for the intensity of light transmitted from the second polaroid. In what orientations will the ransmitted intensity be (i) minimum and (ii) maximum.

The intensity of the light coming from one of the slits in a Young's double slit experiment is double the intensity from the other slit. Find the ratio of the maximum intensity to the minimum intensity in the interference fringe pattern observed.

Two polaroids are kept corssed ("transmission axes at " 90^(@)) to each other. (i) What will be the intensity of the light coming out from the seond polaroid when an unpolarised light of intensity I falls on the first polaroid? (ii) What will be the intensity of light coming out from the second polaroid if a thrid polaroid is kept at 45^(@) inclination to both of them.