21. In long-sightedness, images are formed
22. Optical fiber works on the principal of?
23. Sea seems blue due to
24. Which one among the following has the highest energy?
25. An optical illusion which occurs mainly in deserts during hot summer is based on the principle of
26. Light travels in a straight line (rectilinear propagation of light). This statement does hold, if the medium of travel for light
27. In case of a concave mirror, if an object is kept between principal focus F and pole P of the mirror, then which one of the following statements about the image is not correct?
28. Convex mirrors are used as a rear view mirror in motion cycles because
29. The visible range of solar radiation is
30. Which kind of mirrors is used as rear view wing mirrors in vehicles?
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