Light – Lecture No. 2 (Refraction Through Glass Slab) | Class 10 ScienceIn Lecture No. 2

Описание: Light – Lecture No. 2 (Refraction Through Glass Slab) | Class 10 Science

In Lecture No. 2 of the chapter “Light – Reflection and Refraction”, Prashant Kirath Sir explains the important concept of refraction of light through a glass slab (glass slab / glass tent) in a very simple and NCERT-based manner. This lecture is specially designed for Class 10 CBSE students to build strong conceptual clarity and help in board exam preparation.

The lecture begins with a quick revision of refraction of light and the laws of refraction (Snell’s Laws). Sir then introduces a rectangular glass slab and explains how a ray of light behaves when it travels from air to glass and then from glass back to air. Through neat ray diagrams, he shows the incident ray, refracted ray, emergent ray, angle of incidence, angle of refraction, and angle of emergence.

A major highlight of the lecture is the explanation of lateral displacement. Prashant Sir clearly explains why the emergent ray is parallel to the incident ray but shifted sideways, and how factors like thickness of the glass slab, angle of incidence, and refractive index affect lateral displacement.

The lecture also includes:

Step-by-step ray diagram construction

Explanation of real-life examples of refraction through glass

Important definitions and key terms as per NCERT

Numerical understanding related to refractive index

Board exam-oriented tips and common mistakes to avoid


Overall, this lecture helps students develop a strong understanding of refraction through a glass slab, which is a very important topic for Class 10 board exams. The teaching style of Prashant Kirath Sir makes the topic easy, interesting, and scoring for students.