Ray Optics and Optical Instruments Class 12 Physics Notes – Formulas & Quick Revision

Ray Optics sabse zyada formulas wala optics chapter hai — mirrors, lenses, prism, TIR aur optical instruments. Yahan aapko is chapter ke sabse important formulas aur quick revision points free milte hain — NCERT/CBSE syllabus ke hisaab se, boards aur JEE/NEET dono ke liye.

Important Formulas & Concepts — Ray Optics and Optical Instruments

• Mirror: 1/v + 1/u = 1/f; f = R/2
• Magnification: m = −v/u
• Snell law: n₁sinθ₁ = n₂sinθ₂
• TIR: sinC = 1/n (critical angle)
• Lens: 1/v − 1/u = 1/f
• Lens maker: 1/f = (n−1)(1/R₁ − 1/R₂)
• Power P = 1/f(m) dioptre; contact mein: P = P₁ + P₂
• Prism: n = sin[(A+δ_m)/2]/sin(A/2); microscope/telescope magnifications

Quick Revision Points

• Sign convention (cartesian) consistently lagao — 90% errors yahi hote hain
• Real image inverted, virtual erect
• TIR: denser → rarer, angle > critical
• Diamond ki brilliance TIR se
• Telescope: m = f₀/fₑ; microscope mein dono lenses ka product

FAQ

Sign convention galtiyan kaise ruke?

PDF ke cartesian sign-map ko follow karo — u, v, f, R sabke signs ek chart mein.

Optical instruments ke derivations?

Microscope aur telescope dono ke labelled ray diagrams + magnification derivations PDF mein hain.

Explore more: free sample notes, free calculators aur interactive simulators.