A student uses a spectacle having lens of focal length +40 cm and another student uses a spectacle having lens of focal length -40cm. Which of these two lenses will produce virtual and diminished image irrespective of the position of the object and why?
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A student uses a spectacle having lens of focal length +40 cm and another student uses a spectacle having lens of focal length -40cm. Which of these two lenses will produce virtual and diminished image irrespective of the
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