Huygens construction: the new wavefront is the forward envelope of the waveletsहाइगेंस रचना: नया तरंगाग्र तरंगिकाओं का अग्र आवरण हैHuygens construction: the new wavefront is the forward envelope of the wavelets
NCERT Fig 10.2 · Class 12 Physics · Chapter 10 · interactive diagram
Read Chapter 10 with this diagramइस डायग्राम के साथ अध्याय 10 पढ़ेंIs diagram ke saath Ch 10 padhiyeAll Physics diagramsसभी भौतिकी डायग्रामSaare Physics diagrams
Parts and what they mean
- Point source O (बिंदु स्रोत O) — Centre of the spherical wavefronts.
- Wavefront F₁F₂ at t = 0 (t = 0 पर तरंगाग्र F₁F₂) — The known wavefront we start from.
- Points on the wavefront (तरंगाग्र के बिंदु) — Huygens: every point of a wavefront acts as a source of secondary disturbance.
- Secondary wavelets (द्वितीयक तरंगिकाएँ) — Spheres of radius vτ drawn from each point; they spread with the speed v of the wave.
- Radius vτ (त्रिज्या vτ) — In time τ each wavelet grows to radius vτ (v = speed of the wave in the medium).
- New wavefront G₁G₂ at t = τ (t = τ पर नया तरंगाग्र G₁G₂) — The common tangent (forward envelope) of all wavelets — again a sphere centred at O.
- Backwave D₁D₂ (पश्च तरंग D₁D₂) — The backward envelope does not exist. Huygens assumed wavelets have zero amplitude backwards; the rigorous wave theory justifies its absence.
Original diagram drawn by Simple Learning Hub, based on NCERT Fig 10.2. Report a mistake