C Write short notes on:
1. Characteristics of shadows
2. Formation of day and night
3. Shadow in dim light
4. Parts of a shadow
5. Solar eclipse
Answers
Answer:
ans1) It is always either large or same size as that of the object.
It always black in colour.
Its position changes depending upon the position of source of light.
it needs a screen for being formed.
ans2) The Earth is a sphere, or ball, which spins round and round as it travels around the sun. One side of the Earth faces the sun, while the other side faces away into space. The side facing the sun is bathed in light and heat—we call this daytime. The side facing away is cooler and darker, and experiences night.
ans3) Dim light, also called shadows, creates a lightly obscured area. An area of dim light is usually a boundary between a source of bright light, such as a torch, and surrounding darkness. The soft light of twilight and dawn also counts as dim light.
ans4) The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. Assuming no diffraction, for a collimated beam (such as a point source) of light, only the umbra is cast.
ans 5) A solar eclipse occurs when a portion of the Earth is engulfed in a shadow cast by the Moon which fully or partially blocks sunlight. This occurs when the Sun, Moon and Earth are aligned. Such alignment coincides with a new moon indicating the Moon is closest to the ecliptic plane.
Answer:
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