Ray Optics | Class 12 Physics | Video 3 | Spherical Refraction, Lens Formula & Lens Combination |

Описание: In this video, we continue Ray Optics from Class 12 Physics as per the CBSE / NCERT syllabus.
This lecture covers refraction at spherical surfaces, the lens maker’s equation, and combination of lenses with clear diagrams and step-by-step explanations.

Topics covered in this video:

• Refraction at spherical surfaces
• Refraction formula for spherical surfaces
• Sign conventions for lenses
• Focal length of a lens
• Lens maker’s equation
• Convex and concave lenses
• Combination of lenses in series
• Equivalent focal length
• Power of lenses
• Image formation by single and combination of lenses
• Applications of lenses in optics

Important formulas discussed:

Refraction at spherical surface:
v / u - v / u = (n₂ - n₁) / R

Lens maker’s equation:
1/f = (n - 1) (1/R₁ - 1/R₂)

Combination of lenses in contact:
1/F = 1/f₁ + 1/f₂ + …

Power of lens:
P = 100 / f (f in cm)

This video is useful for:

• Class 12 CBSE board exams
• State board students
• NEET / JEE foundation
• Understanding lens numericals
• Conceptual clarity in ray diagrams and lens applications

📘 Next video will cover:

• Refraction through prism
• Deviation and angle of deviation
• Dispersion of light
• Numerical problems on lenses

👨‍🏫 Faculty: Sureshkumar
🎓 Qualification: M.Sc. Physics & Electronics
📜 Qualified: TNSET | CTET | TNTET
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📧 Email: [email protected]