Question 1

Which of the following is the locus of all points in a medium vibrating in the same phase?

Accepted Answer

The correct answer is Wavefront. A wavefront is defined as the locus of all adjacent points (particles) of the medium vibrating in the same phase at any given instant. Depending on the source, it can be spherical, cylindrical, or plane.

Question 2

According to Huygens' principle, each point on a wavefront acts as a source of secondary:

Accepted Answer

The correct answer is Wavelets. According to Huygens' principle, every point on a given wavefront acts as a source of secondary disturbance, emitting secondary spherical wavelets in all directions with the speed of light.

Question 3

The phenomenon of bending of light around the corners of an obstacle or aperture is called:

Accepted Answer

The correct answer is Diffraction. Diffraction is the slight bending of light as it passes around the edge of an object or through a small opening, which is a characteristic behavior of waves.

Question 4

Which of the following phenomena proves the transverse nature of light waves?

Accepted Answer

The correct answer is Polarization. Polarization is exclusive to transverse waves because only transverse waves can have oscillations restricted to a specific plane perpendicular to the direction of wave propagation.

Question 5

In Young's double slit experiment, the fringe width (beta) is given by the formula:

Accepted Answer

The correct answer is beta = lambda D / d. Here, lambda is the wavelength of light, D is the distance between the slits and the screen, and d is the distance between the two slits.

Wave Optics — MP Board Class 12 Physics Important Questions & Revision Notes