3.1. Light and its Spread

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Questions and Answers

What happens when light falls on a transparent object?

  • The light passes through the object. (correct)
  • The light is reflected by the object.
  • The light is absorbed by the object.
  • The light is refracted by the object.

What happens when light falls on an opaque object?

  • The light is reflected by the object.
  • The light is refracted by the object.
  • The light is absorbed by the object. (correct)
  • The light passes through the object.

What happens when light falls on a mirror?

  • The light is absorbed by the mirror.
  • The light is transmitted through the mirror.
  • The light is reflected by the mirror. (correct)
  • The light is diffracted by the mirror.

What happens when light falls on a glass object?

<p>The light is both transmitted and reflected by the glass. (A)</p> Signup and view all the answers

How does light travel?

<p>In a straight line. (A)</p> Signup and view all the answers

Which of the following is an example of a non-luminous body?

<p>A computer screen (A)</p> Signup and view all the answers

What is the primary source of light for the moon?

<p>The Sun (B)</p> Signup and view all the answers

Which statement best describes how we see a non-luminous body like an armchair?

<p>Light from a source reflects off the armchair and enters our eyes. (A)</p> Signup and view all the answers

What is the essential characteristic that allows light to travel through empty space?

<p>Light travels as a wave, not requiring a medium to propagate. (B)</p> Signup and view all the answers

How does light travel from the sun to the Earth?

<p>Light travels in straight lines, even though the sun and Earth are in motion. (A)</p> Signup and view all the answers

Flashcards

Light

A form of energy that allows us to see objects.

Illuminating Light Sources

Bodies that produce visible light, like the sun or bulbs.

Non-Illuminating Objects

Objects that do not produce light but can reflect it.

Propagation of Light

Light travels in straight lines and can move through vacuum.

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Luminous Bodies

Objects that emit their own light, like stars and lamps.

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Light propagation

Light spreads in a straight line unless obstructed.

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Transmitted light

Light that passes through an object, seen in translucent/transparent materials.

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Absorbed light

Light that is taken in by an object, making it warm; the object appears opaque.

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Reflected light

Light that bounces off an object, like a mirror.

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Non-light-source visibility

We see objects that do not emit light because they reflect light to our eyes.

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Study Notes

Light and its Spread

  • Light is critical in observing things and creating shadows
  • Light is a form of energy transfer
  • Light sources are classified as illuminating or non-illuminating
  • Illuminating bodies produce light
  • Non-illuminating bodies reflect light
  • Light travels in a straight line
  • Light from a lamp spreads in a straight line
  • We see non-light-producing objects because they reflect light onto our eyes

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