The Huygens-Fresnel principle states that every point on a wavefront is a source of wavelets. These wavelets spread out in the forward direction, at the same speed as the source wave. The new wavefront is a line tangent to all of the wavelets.
67) According to Huygens construction relation between old and new wave fronts is
Answer is:
new wave front is the forward envelope of the secondary waves
Explanation:
Related Optics MCQ with Answers
Answer is:
Rays are perpendicular to wave front
Explanation:
Relation between ray and wave front is Rays are perpendicular to wave front
Answer is:
resultant displacement is the vector sum of the displacements produced
Explanation:
According to superposition principle in relation to displacements produced by a number of waves resultant displacement is the vector sum of the displacements produced
Answer is:
same frequency and with a constant phase relationship
Explanation:
Two sources of light are coherent if they have same frequency and with a constant phase relationship
Answer is:
the sources are coherent
Explanation:
Interference effects of light from two sources can be observed if the sources are coherent