A. Explain them
1. Ray of light
3. Umbra
5. Rectilinear propagation of lig
Answers
Answer:
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Explanation:
1) Ray of light: The direction or path along which light energy travels in a medium is called a ray of light. It is represented by a straight line with an arrow marked on it. Beam of light: A group of light rays is called a beam of light. A beam of light may be parallel, convergent or divergent, as shown in Fig.
2) The umbra (Latin for "shadow") is the innermost and darkest part of a shadow, where the light source is completely blocked by the occluding body. ... The distance from the Moon to the apex of its umbra is roughly equal to that between the Moon and Earth: 384,402 km (238,856 mi).
3) Rectilinear propagation describes the tendency of Electromagnetic waves (light) to travel in a straight line. Lightonly deviates from a straight line when the medium it is travelling through changes density. This is called refraction. ... The light is blocked if anyone of the cardboard squares are moved even a tiny bit.