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Question - Refraction at Spherical Surfaces and by Lenses - Power of a Lens

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ConceptRefraction at Spherical Surfaces and by Lenses - Power of a Lens  

Question

What is meant by power of a lens? Define its SI unit. You have two lenses A and B of focal lengths +10 cm and –10 cm, respectively. State the nature and power of each lens. Which of the two lenses will form a virtual and magnified image of an object placed 8 cm from the lens? Draw a ray diagram to justify your answer

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