CBSE 12th Physics Delhi Set 1 - 2024 | Wave Optics Question 2 | Physics

Assertion (A): In a Young's double-slit experiment, interference pattern is not observed when two coherent sources are infinitely close to each other.

Reason (R): The fringe width is proportional to the separation between the two sources.

If both Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).

If both Assertion (A) and Reason (R) are true and Reason (R) is not the correct explanation of Assertion (A).

If Assertion (A) is true but Reason (R) is false.

If both Assertion (A) and Reason (R) are false.

CBSE 12th Physics Delhi Set 1 - 2023

MCQ (Single Correct Answer)

-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.

Both (i) and (ii) remain constant.

(i) remains constant, but (ii) decreases.

(i) remains constant, but (ii) increases.

Both (i) and (ii) increase.

CBSE 12th Physics Delhi Set 1 - 2023

MCQ (Single Correct Answer)

-0

According to Huygens principle, the amplitude of secondary wavelets is

equal in both the forward and the backward directions.

maximum in the forward direction and zero in the backward direction.

large in the forward direction and small in the backward direction.

small in the forward direction and large in the backward direction.

CBSE 12th Physics Outside Delhi Set 1 - 2023

MCQ (Single Correct Answer)

-0

A beam of light travels from air into a medium. Its speed and wavelength in the medium are $$1.5 \times 10^8\mathrm{ms}^{-1}$$ and $$230 \mathrm{~nm}$$ respectively. The wavelength of light in air will be

230 nm

345 nm

460 nm

690 nm