Principal Focus and Focal Length of a Convex Lens | Class 10 Physics 2022-23

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Published on September 7, 2020 5:50:27 AM ● Video Link: https://www.youtube.com/watch?v=_-WCzq_ZLgg

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✅ In this video,

✔️ Class: 10th
✔️ Subject: Physics
✔️ Chapter: Light: Reflection And Refraction (Chapter 10)
✔️ Topic Name: Principal Focus And Focal Length of A Convex Lens - Light: Reflection And Refraction | Class 10 Physics Chapter 10 (2022-23)
✔️ Topics Covered In This Video (by Vibhuti Ma'am): This YouTube video discusses the topics of light reflection and refraction specifically as related to the principle focus and focal length of a convex lens. It is geared towards Class 10 science students for the academic year 2022-23. The presentation is given by Vibhuti Mam, an experienced Class 10 Physics instructor. Students will gain practical knowledge about the topic and gain the skills necessary to apply their understanding to real-world scenarios.
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00:00 Introduction: Light: Reflection And Refraction
00:05 Principal Focus And Focal Length of A Convex Lens
28:56 Website Overview
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Points covered in this video:-

Principal Focus and Focal Length of a Convex Lens -
A convex lens has two surfaces and hence it has two principal foci or two focal points:

First Principal Focus:
- First principal focus of a convex lens is the position of a point object on the principal axis of the lens, for which the image formed by the lens is at infinity.
- First principal focus of convex lens is represented by the point F1.
- The distance of first principal focus of the lens from optical centre O of the lens is called first focal length of convex lens.
- It is represented by f1 .
- Thus, OF1 = f1

Second Principal Focus:
- Second principal focus of a concave lens is the position of an image point on the principal axis of the lens, when the point object is situated at infinity.
- Second principal focus of convex lens is represented by the point F2.
- Rays from an object at infinity fall on convex lens in a direction parallel to the principal axis of the lens.
- On refraction through convex lens, they actually meet at a point F2 on the principal axis of the lens, where a point image is formed

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