Kerala 10th Physics Chapter 2 Lenses class notes

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The following notes on Physics Chapter 2 Lenses are designed to provide a comprehensive understanding of lenses, their properties, image formation, and applications, tailored for examination preparation. The content is structured with explanations, tables, comparisons, and key points to facilitate effective learning.

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Lenses are transparent media with two refracting surfaces, at least one of which is curved (part of a  sphere). They are used to converge or diverge light rays, enabling applications in devices like
telescopes, microscopes, spectacles, and cameras. 

• Key Question: How do lenses, such as those in telescopes, make distant objects appear distinct and close?
• Applications of Lenses:
o Toys
o Spectacles
o Door lenses (for viewing outside)
o Cameras
o Microscopes
o Telescopes

Difference Between Lenses and Glass Sheets 

• Glass Sheet: When sunlight passes through a thin glass sheet, the size of the illuminated area on paper remains constant regardless of the distance between the sheet and paper.
• Lens: A lens, when held at a specific distance, reduces the illuminated area significantly, increasing light intensity, and can even cause paper to smolder or catch fire due to concentrated light.

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