The Huygens principle states that every point of a wavefront acts as

Question

Accepted Answer

A. {'text': 'A source of new secondary spherical wavelets', 'label': 'A'}

1. Christiaan Huygens proposed the wave theory of light in 1678.
2. Every point on a wavefront acts as a source of secondary wavelets.
3. Envelope of secondary wavelets at a later instant gives the new wavefront.
4. This construction explains reflection, refraction and diffraction.
_Source: NCERT Class 12 Physics, Ch 10 "Wave Optics", §10.2_

Answer

{'text': 'A mirror reflecting incident radiation', 'label': 'B'}

Answer

{'text': 'A polariser filtering vibrations', 'label': 'C'}

Answer

{'text': 'A monochromatic light source only', 'label': 'D'}