Physics
Opaque objects cast a dark shadow. Three opaque objects are placed one after the other in the given figure. Draw the shadow that will be casted on the screen.
Answer
Shadow of the given arrangement is given below :
Explanation:
Light travels in straight lines, showing rectilinear propagation of light. Since the torch acts approximately as a point source of light, each opaque object can form an umbra (completely dark region) and not a noticeable penumbra.
The football, being the first opaque object closest to the light source, blocks the light completely and produces a dark umbra on the screen but the box and the teddy bear are placed entirely within the umbra formed by the football. As no light reaches these objects, they do not form separate umbra or penumbra on the screen.
Hence, the shadow observed on the screen is only the umbra corresponding to the football, with no additional penumbra due to the objects placed behind it.
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All the bodies in our solar system are luminous except the sun and the stars. We can see other heavenly bodies of the solar system only when the light from earth falls on them. The sun revolves around the earth and the moon revolves around the earth. While revolving, the sun, earth and moon come in a straight line. This results in blocking of light from the moon. Eclipse is defined as the partial or total blocking of the heat of the sun by a heavenly body. There are two types of eclipses called the solar eclipse and the lunar eclipse. When the earth casts its shadow on the earth, a solar eclipse is said to occur. When the earth casts its shadow on the moon, a lunar eclipse is said to occur. Solar eclipse occurs on a full moon night. Lunar eclipse occurs on a new moon night.
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