2 Answers

Shadows and eclipses result from the…

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PHYSICS

Shadows and eclipses result from the

A. refraction of light

B. reflection of light.

C. diffraction of light

D. rectilinear propagation of light

QUICK ANSWER…

D

DETAILS…

Shadows and eclipses form because light travels on a straight line, this is exactly what rectilinear propagation of light means. As light travels on a straight line, opaque objects cause shadows to form on the other side, even as opaque celestial bodies cause eclipses.

Now for the right answer to the above question:

  1. Option A is incorrect. refraction involves change in direction as light changes medium of travel, this is not the cause of shadows and eclipses.
  2. Option B is incorrect. reflection of light is not the cause of shadows and eclipses.
  3. C is incorrect. diffraction of light involves bending of light as it passes through a medium.
  4. D is the correct answer. Light travels in a straight line.

KEY-POINTS…

You may please note these/this:

  • Rectilinear propagation of light is responsible for the formation of shadows and eclipses by bodies positioned along the path of its travel.
  • When light rays from the sun is blocked from reaching the earth, an eclipse has occurred.
  • When light rays from a light source is blocked by a body, we have a shadow.

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/ culled from 2018 JAMB-UTME physics question 14 /

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