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Which of the following properties of light can be used to explain the phenomenon of shadow formation? A. Light travels in a straight line. B. Light travels at a high speed. C. Light is composed of seven colours. D. Light does not pass through opaque objects.

Which of the following properties of light can be used to explain the phenomenon of shadow formation? A. Light travels in a straight line. B. Light travels at a high speed. C. Light is composed of seven colours. D. Light does not pass through opaque objects. Correct Answer D and A

Concept:

Light:

  • Light is a form of energy, which produces the sensation of vision in our eyes. 
  • The objects around us reflect light. The reflected light reaches our eyes and make that thing visible to us. 
  • Luminous objects like Sun, stars, electric bulbs etc have their own light and they are considered a source of light. 
  • Non Luminous objects are those objects which do not have their own light but reflect the light coming from some source.
  • Light travels in a straight line in a given medium. 

Transparent, translucent, and opaque object

  • Transparent object: The object that allows light to pass through them or the objects across we can see are transparent objects. Examples. Glass, water.
  • Translucent object: The object that partially allows light to pass through them are translucent objects. Example filter paper.
  • Opaque object: The object across which light cannot pass are called opaque object, for example, cardboard, books, etc. 

Shadow Formation

  • A shadow is a black spot that is formed when an opaque object comes into the path of light. 
  • This happens because light travels in a straight line and if there is any obstacle in between the light could not pass through it.
  • It is formed on the screen which could be a wall or anything like that. 
  • The size of the shadow depends upon the distance between opaque objects and sources of light. 

Explanation:

For the shadow formation, source of light, screen and opaque object all are required. 

So, these properties of light can be used to explain the phenomenon of shadow formation:

A. Light travels in a straight line.

D. Light does not pass through opaque objects.

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