Read the following statements carefully and identify the correct statements.

(A) Most interference and diffraction effects exist even for longitudinal waves like sound in air
(B) Optical fibers work on the phenomenon of total internal reflection
(C) Optical density and mass density are the same
(D) Polarisation phenomena are specific to transverse waves like light waves

Choose the correct answer from the options given below:

(A), (B) and (D) only

The correct answer is Option (3) → (A), (B) and (D) only

Correct statements:

(A) Most interference and diffraction effects exist even for longitudinal waves like sound in air

Explanation: Sound waves in air are longitudinal, yet phenomena like interference and diffraction are observable, e.g., in acoustics.

(B) Optical fibers work on the phenomenon of total internal reflection

Explanation: Light remains trapped inside the fiber due to total internal reflection, allowing efficient transmission over long distances.

(D) Polarisation phenomena are specific to transverse waves like light waves

Explanation: Only transverse waves have vibrations perpendicular to the direction of propagation, which allows polarisation to occur.