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26. The minimum distance between an object and its real image in a convex lens is (NTSE West Bengal, Stage-I, 2014-15)

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27. A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is cut (NTSE Bihar, Stage-I, 2014-15)

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28. A screen is placed at a distance 40 cm away from an illuminated object. A converging lens if placed between the source and screen and attempt is made to form an image on screen. If no position could be found. The focal length of the lens (NTSE Bihar, Stage-I, 2014-15)

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29. A concave mirror of focal length is 10 cm produces an image five times large and real. The distance of object from the mirror will be (NTSE Uttar Pradesh, Stage-I, 2014-15)

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30. A vessel is 2 meter deep. How deep will it appear if it is filled with water and viewed from above? (NTSE Jharkhand, Stage-I, 2014-15)

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