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प्रश्न
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?
उत्तर
The same image will be formed by these holes. These opaque strips will act as pinholes and an image of the sun will be obtained on the wall.
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संबंधित प्रश्न
What are luminous objects?
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.
Is air around us always transparent? Discuss.
