Question

Figure shows a glowing mercury tube. The intensities at point A, B and C are related as
(a) B > C > A
(b) A > C > B
(c) B = C > A
(d) B = C < A
Figure

Answer 1

Correct option (d)

Here, since B and C have the same distance and lie inclined to make the the same vertical angle with the source, they will have same intensity. But, as A is nearer and forms an angle of 0⁰ with the source, intensity of A will be greater than C or B.