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A convex lens of focal length $15\ \text{cm}$, is forming a real image. If the size of image is same as the size of object, then position of object and position of image will be, respectively :
- (a)$15\ \text{cm}$ and $-15\ \text{cm}$ from lens
- (b)$-15\ \text{cm}$ and $+15\ \text{cm}$ from lens
- (c)$-30\ \text{cm}$ and $+30\ \text{cm}$ from lens
- (d)$-30\ \text{cm}$ and $-30\ \text{cm}$ from lens
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(C) / - 30 cm and + 30 cm from lens
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