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1
CBSE 12th Physics Delhi Set 1 - 2023
MCQ (Single Correct Answer)
+1
-0

In a Young's double-slit experiment, the screen is moved away from the plane of the slits. What will be its effect on the following?

(i) Angular separation of the fringes.

(ii) Fringe-width.

A
Both (i) and (ii) remain constant.
B
(i) remains constant, but (ii) decreases.
C
(i) remains constant, but (ii) increases.
D
Both (i) and (ii) increase.
2
CBSE 12th Physics Delhi Set 1 - 2023
MCQ (Single Correct Answer)
+1
-0

According to Huygens principle, the amplitude of secondary wavelets is

A
equal in both the forward and the backward directions.
B
maximum in the forward direction and zero in the backward direction.
C
large in the forward direction and small in the backward direction.
D
small in the forward direction and large in the backward direction.
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