JEE PYQ: Wave Optics Question 8
Question 8 - 2021 (25 Feb Shift 2)
Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 mm. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that:
(1) its size decreases, but intensity increases
(2) its size increases, but intensity decreases
(3) its size increases, and intensity increases
(4) its size decreases, and intensity decreases
Show Answer
Answer: (1)
Solution
$\sin\theta = \frac{1.22\lambda}{d}$
If D is increased, then $\sin\theta$ will decrease.
$\therefore$ size of circular fringe will decrease but intensity increases.
BETA
