Wavefronts: spherical (near a point source) and plane (far away)तरंगाग्र: गोलीय (बिंदु स्रोत के पास) और समतल (बहुत दूर)Wavefronts: spherical (near a point source) and plane (far away)

NCERT Fig 10.1 · Class 12 Physics · Chapter 10 · interactive diagram

Parts and what they mean

• Point source (बिंदु स्रोत) — Sends waves equally in all directions.
• Spherical wavefront (गोलीय तरंगाग्र) — All points on a sphere around the source are at the same distance, so they oscillate in phase — a surface of constant phase.
• Rays (radial) (किरणें (त्रिज्य)) — Energy travels perpendicular to the wavefront, so rays point straight out from the source.
• Plane wavefront (समतल तरंगाग्र) — Far from the source a small part of a huge sphere is practically flat — e.g. light from the Sun or a distant star.
• Parallel rays (समांतर किरणें) — For a plane wavefront all rays are parallel (and perpendicular to the wavefront).

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 10.1. Report a mistake