Ray Optics and Optical Instruments 04|Refraction and refraction through glass slab|Physics Class 12

Ray Optics & Optical Instruments | Refraction of Light through a Glass Slab | Physics Class 12

Description:
Welcome to another lecture by Shree Ram Educators, designed specifically for CBSE Class 12 Physics (Chapters on Ray Optics & Optical Instruments).
In this video, we cover:
• The phenomenon of refraction of light — what happens when a ray of light passes from one medium to another, how its speed and direction change.
• Application of Snell’s Law in analysing refraction at the interface of two media.
• Detailed discussion of a glass slab experiment: a parallel-sided glass slab, incident ray, refracted ray, emergent ray, the concept of lateral displacement (shift) and how it is derived.
• How to draw ray diagrams properly for refraction through a glass slab and how to derive the expression for lateral shift.
• Important practical points, derivations, and tips for CBSE board exams and sample papers.
• Worked examples and exam-style questions to strengthen your understanding.

Why this topic matters:
Refraction through a glass slab is a fundamental experiment in optics and is frequently asked in board exams. A strong grasp on this helps with other topics like lenses, optical instruments, image formation and more.

Key take-aways:
✔ Understand how and why light bends when entering and exiting a medium.
✔ Learn the proper way to sketch and label the incident, refracted and emergent rays in a glass slab.
✔ Grasp the relation for lateral shift ( Δ = t sin(i−r)/cos r or equivalent) and know which factors it depends on.
✔ Be exam-ready: remember the diagram, formula, factors affecting shift and qualitatively what changes when slab thickness or refractive index changes.

For students of Shree Ram Educators:
Use this video as part of your revision for chapters 1 to 6 of Ray Optics & Optical Instruments. Pause at each step, draw the diagrams on your own, solve the example questions and then attempt the worksheets we provide in class.
Don’t forget to subscribe, like and hit the bell icon so you don’t miss future videos covering lenses, microscopes, telescopes and more.

Tip: While watching, keep your notebook and drawing board ready. Pause the video at key points, draw the diagrams yourself and annotate. This active engagement makes the concept more memorable.

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