Q. Convection currents do not occur in

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Q. Without convection, the average surface air temperature on the Earth would be

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Q. The movement of air in and out the chimneys due to a difference in density sets up a

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Q. With convection, the current surface air temperature on the Earth is

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Q. They spread out light rays

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Q. When passing through a thin converging lens, the possible paths in which light rays can travel along are

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Q. The lens which is thick at the center but thin at the edges is called

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Q. Any transparent material having two surfaces of which at least one is curved is called

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Q. The focal point is also termed as

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Q. The lens which causes incident parallel rays of light to diverge at a point is called

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Q. The distance between the optical center and the focal point is called

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Q. Light rays are brought to focus at a point in

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Q. The rays passing through the optical center are

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Q. The point at which all rays parallel to the principal axis converge to after refraction by the lens is called

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Q. The horizontal line passing symmetrically through the optical center of the lens is known as

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Q. The lens which is thin at the center but thick at the edges is called

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Q. The plane which passes through focal point and principal axis is known as

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Q. The types of lenses are

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Q. The lens which causes incident parallel rays to converge at a point is called

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Q. The midway point between the lens surfaces on its principal axis is known as

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