Single slit of width a: path difference between its edges is a sin θचौड़ाई a की एकल झिरी: इसके किनारों के बीच पथांतर a sin θSingle slit of width a: path difference between its edges is a sin θ
NCERT Fig 10.14 · 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
- Parallel beam (plane wave) (समांतर किरण पुंज (समतल तरंग)) — Falls normally on the slit, so all points of the slit are secondary sources in phase.
- Single slit LN (एकल झिरी LN) — A narrow opening; M is its midpoint.
- Slit width a (झिरी की चौड़ाई a) — Diffraction is noticeable when a is comparable to a few wavelengths.
- Normal MC (अभिलंब MC) — Line through M perpendicular to the slit plane; it meets the screen at C (θ = 0).
- Rays to P at angle θ (कोण θ पर P तक किरणें) — Lines from L, M, N to a far point P are treated as parallel, all at angle θ to MC.
- Path difference NQ (पथांतर NQ) — Between the two edges: NP − LP = a sin θ ≈ aθ. Minima where aθ = nλ (n = ±1, ±2, …).
- Angle θ (कोण θ) — Direction of P measured from the normal MC.
- Point P on the screen (पर्दे पर बिंदु P) — The contributions of all parts of the slit are added here with their phase differences.
- Centre C (केंद्र C) — All paths equal: central maximum.
- Screen (पर्दा) — Diffraction pattern appears here.
Original diagram drawn by Simple Learning Hub, based on NCERT Fig 10.14. Report a mistake