1.

Statement I : The air film in Newton's rings apparatus is replaced by an oil film. The radii of the rings, decreases. Statement II : A slit of width 'a' is illuminated by white light. The first minima for red light (lambda = 6500 Å) will fall at theta = 30^(@) when value of a is 1.3 micron.

Answer»

Statement I is TRUE, statement II is false.
Statement I is false, statement IIis true
Statement I is true, statement II is true and statement I is correct explanation of statement II
Statement I is true, statement II is true and statement II is not correct explanation of statement I.

Solution :`I = I_(0)cos^(2)theta, 3/4 I_(0) = I_(0) cos^(2)theta, then theta = 30^(@)`
(ANGLE between analyser and polariser). So the angle that analyser makes with beam in `90^(@) - 30^(@) = 60^(@)`.


Discussion

No Comment Found

Related InterviewSolutions