Class 12 Exam > Class 12 Notes > Lens - Class 12
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Lens
A Lens is a type of mirror which refracts the light instead of reflection.Refraction is the bending of a light when it enters a medium. Here the medium is Lens.
- Lens are of various types but the two most important types are convex (on Bi-convex) and concave (or Bi-concave) lens
- Convex lens are thicker in middle than the edges whereas concave lens are thinner at the middle than at the edges
- Lenses are transparent and light can pass through them.
- Convex lens are also called convergent as they concentrate (bend inward) the light falling on it.
- Concave lens are also called divergent lens as they expand the light (bend outward) falling on it.
- Real images are formed using convex lens by placing them in between the object and the screen.
- Virtual images are also formed by convex lens which is erect and larger in size.
- Concave lens do not form real images. They only form virtual images which are always erect and smaller in size.
- Applications of lens include magnifying glass, telescopes, contact lens, cameras etc.
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Mar 02, 2025
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Document Description: Lens - Class 12 for Class 12 2025 is part of Class 12 preparation. The notes and questions for Lens - Class 12 have been prepared according to the Class 12 exam syllabus. Information about Lens - Class 12 covers topics like and Lens - Class 12 Example, for Class 12 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Lens - Class 12.
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Full syllabus notes, lecture & questions for Lens - Class 12 - Class 12 | Plus excerises question with solution to help you revise complete syllabus | Best notes, free PDF download
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