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प्रश्न
A convex lens of focal length 15 cm produces a magnification of +4. The object is placed:
(a) at a distance of 15 cm
(b) between 15 cm and 30 cm
(c) at less than 15 cm
(d) beyond 30 cm
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उत्तर
At less than 15 cm:
A convex lens forms a virtual, erect and magnified image when an object is placed within the focus.
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