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A student used a device X to obtain focus the image of a well illuminated...

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Physics

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A student used a device X to obtain focus the image of a well illuminated distant building on a screen S as shown below in the diagram Select the correct statement about the device X S 8 cm A This device is a concave lens of focal length 8 cm B This device is a convex mirror of focal length 8 cm C This device is a convex lens of focal length 4 cm D This device is a convex lens of focal length 8 cm

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