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How does a concave lens or diverging lens can form a real image of a real object?

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How does a concave lens or diverging lens can form a real image of a real object?

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Ans. A concave lens cannot form a real image of a real object in the air. If the concave lens is placed in a medium of refractive index greater than that of glass, then, it will form real image of a real object.
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