Numericals (Part -2) - Light: Reflection And Refraction | Class 10 Physics 2022-23
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In this video,
โ๏ธ Class: 10th
โ๏ธ Subject: Physics
โ๏ธ Chapter: Light: Reflection And Refraction (Chapter 10)
โ๏ธ Topic Name: Numerical - Light: Reflection And Refraction (Part 2) | Class 10 Physics Chapter 10 (2022-23)
โ๏ธ Topics Covered In This Video (by Vibhuti Ma'am): This YouTube video is perfect for students in Class 10 who are studying Science, especially those preparing for their board exams in 2022-23. In this video, Vibhuti Mam explains the concept of light and its related topics, namely Reflection and Refraction, in detail. The video also offers solutions to numerical problems, helping viewers understand the theories better and answer their questions. This video is a great resource for those who want to get a better understanding and have their doubts cleared.
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00:00 Introduction: Light: Reflection And Refraction
00:03 Numerical of Light Reflection And Refraction
14:22 Website Overview
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Points covered in this video:-
Question. When a concave mirror is placed facing the sun, the sunโs rays converge to a point 10 cm from the mirror. Now, if you place a 2 cm long candle flame 20 cm away on the principal axis of the mirror, where would you place a screen to obtain the image of the candle? What would be the size of the image? Draw a ray diagram to justify your answer?
Solution. As sunโs rays converge to a point 10 cm from the concave mirror, therefore, focal length of mirror f = -(10)cm. Now,
h1 = 2 cm, u = -20 cm, v =?
From,
1/v + 1/u = 1/f
1/ v = 1/f - 1/u
1/v = 1/(-10) - 1/(-20)
1/v = -1/20
v = -20 cm
As, h2/h1 = -v/u = - (-20/-20) = -1
h2 = -h1 = -2 cm
Minus sign is for inverted image. The course of ray is as shown in figure
AโBโ is real, inverted image of AB at C only.
Question. It is desired to obtain an erect image of an object using a concave mirror of focal length 12 cm.
What should be the range of object distance in this case?
Will the image be smaller or larger than the object/ draw a ray diagram to show the formation of image in this case.
Where will the image of this object be, if it is placed 24 cm in front of the mirror?
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