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प्रश्न
What are luminous objects?
उत्तर
All objects which emit light energy by themselves are called luminous objects. Ex.: Sun, electric bulb.
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संबंधित प्रश्न
Is the moon a luminous object?
What are the difference between luminous and non-luminous objects? Give two examples of each.
Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous:
Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, firefly, moon.
You have 3 opaque strips with very small holes of different shapes as shown in Fig. 11.5. If you obtain an image of the sun on a wall through these holes, will the image formed by these holes be the same or different?
Is air around us always transparent? Discuss.
