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The Sun appears reddish during sunrise and sunset. The phenomenon in optics which is responsible for this appearance of the Sun is
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Important Questions on Ray Optics
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A lens has a power of Dioptre. Which one of the following statements about the lens is true?
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The refractive index of fused quartz is and that of sapphire is If is the speed of light in quartz and is the speed of light in sapphire, then which one of the following relations is correct?
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In case of a concave mirror, if an object is kept between principal focus and pole of the mirror, then which one of the following statements about the image is not correct?
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Which one of the following statements regarding lenses is not correct?
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Light rays move in straight lines. But through an optical fibre, they can move in any type of zig-zag path because
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The light energy escaping from the sun can be spread by
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The focal length of the objective lens of a telescope is If the magnification of the telescope is then the focal length of the eyepiece is
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The sun is seen little before it rises and for a short while after it sets. This is because of
