Power of a Combination of Lenses - Light: Reflection And Refraction | Class 10 Physics 2022-23

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Published on September 9, 2020 7:00:12 AM ● Video Link: https://www.youtube.com/watch?v=jrpLDS-hXR8

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✅ In this video,

✔️ Class: 10th
✔️ Subject: Physics
✔️ Chapter: Light: Reflection And Refraction (Chapter 10)
✔️ Topic Name: Power of A Combination of Lenses - Light: Reflection And Refraction | Class 10 Physics Chapter 10 (2022-23)
✔️ Topics Covered In This Video (by Vibhuti Ma'am): In this video, Vibhuti Mam will explain the power of a combination of lenses in relation to light such as reflection and refraction, from the Class 10 Physics Chapter 10 topic. Learn more about understanding the laws of refraction, the different types of lenses, and the ways in which light is affected when light passes through them in this comprehensive class 10 science video for the year 2022-23.
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00:00 Physics Introduction: Light: Reflection And Refraction
00:04 Power of A Combination of Lenses
11:37 Question & Solution: Numerical Based on Power: Physics
Question. A concave lens has a focal length of 50 cm. Calculate its power.
28:47 Website Overview
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Points covered in this video:-

Power of a Combination of Lenses -
- When a number of thin lenses are placed in contact with one another, the power of the combination is equal to algebraic sum of the powers of individual lenses.
- If P1, P2, P3… are the powers of individual lenses are placed in contact with one another, the power P of the combination is
P = P1 + P2 + P3 + ….
- Note that individual powers have to be taken with proper sign
+ve for convex lens
-ve for concave lens
- For example; when a convex lens of power + 5D is placed in contact with a concave lens of power -2D, the power of the combination is P = P1 + P2 = 5D - 2D = 3D
- Thus this combination would behave as a convex lens of power + 3D.

Numericals based on Power -
Question. A concave lens has a focal length of 50 cm. Calculate its power.

Question. A thin lens has a focal length of -25 cm. What is the power of the lens? Is it convex or concave?
Solution. Here,
f = -25 cm, P = /from P = 100/f = 100/-25 = -4D
Negative sign shows that the lens is concave.

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