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Draw a ray diagram to show how a converging lens can form an image of the sun. Hence give a reason for the term ‘burning glass’ for a converging lens used in this manner.
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A lens forms an inverted image of an object. What is the nature of the image real or virtual?
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An object is placed at a distance of more than 40 cm from a convex lens of focal length 20 cm. The image formed is real, inverted and ______.
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An object is placed at a distance 2f from a convex lens of focal length f. The size of the image formed is ______ that of the object.
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An object is placed at a distance 5 cm from a convex lens of focal length 10 cm. The image formed is virtual, upright and _____.
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For the object placed between the optical centre and focus of a convex lens, the image is ______.
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A body falls freely under gravity from rest. Name the kind of energy it will possess at the point from where it falls.
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A ball of mass m is thrown vertically up with an initial velocity so as to reach a height h. The correct statement is:
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What is the mechanical advantage of a single movable pulley in the ideal case?
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Name a machine which is used to multiply force.
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Following Fig shows piece of cardboard of uniform thickness cut into different shapes. Draw two lines to indicate the position of centre of gravity G.

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Following Fig shows piece of cardboard of uniform thickness cut into different shapes. Draw two lines to indicate the position of centre of gravity G.

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Following Fig shows piece of cardboard of uniform thickness cut into different shapes. Draw two lines to indicate the position of centre of gravity G.

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Following Fig shows piece of cardboard of uniform thickness cut into different shapes. Draw two lines to indicate the position of centre of gravity G.

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