Gr 8 Natural Sciences Ch 3.4: Reflection of light
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Questions and Answers

What happens to the reflected rays when light reflects off a smooth surface?

  • They are absorbed by the surface
  • They are parallel (correct)
  • They scatter in different directions
  • They change color

    • What is reflection of light?

  • The bouncing of light off a surface (correct)
  • The bending of light around a corner
  • The property of light that allows it to pass through a surface
  • The absorption of light by a surface

    • What is an example of a rough surface?

  • A mirror
  • A laser beam
  • A prism
  • Rippled water (correct)

    • What is the purpose of measuring the angles of incidence and reflection in the practical investigation?

    <p>To verify that they are equal</p> Signup and view all the answers

    What is the incident ray?

    <p>The ray of light that strikes a surface</p> Signup and view all the answers

    What is the type of reflection that occurs on a smooth surface?

    <p>Specular reflection</p> Signup and view all the answers

    What is the purpose of the normal line?

    <p>To understand and measure reflection</p> Signup and view all the answers

    What is the result of light reflecting off a rough surface?

    <p>A diffuse and unclear reflection</p> Signup and view all the answers

    What is the relationship between the angle of incidence and the angle of reflection?

    <p>The angle of incidence is equal to the angle of reflection</p> Signup and view all the answers

    What happens to light when it reflects off a surface?

    <p>It changes direction</p> Signup and view all the answers

    What is the reflected ray?

    <p>The ray of light that bounces off a surface</p> Signup and view all the answers

    What is the term for being at an angle of 90 degrees to a given line or surface?

    <p>Perpendicular</p> Signup and view all the answers

    What is an example of a reflective surface?

    <p>A still lake</p> Signup and view all the answers

    What is the primary difference between a smooth surface and a rough surface in terms of reflection?

    <p>Uniformity of reflected rays</p> Signup and view all the answers

    What can be observed when shining a flashlight at different angles on a mirror?

    <p>The angle of incidence is always equal to the angle of reflection</p> Signup and view all the answers

    What is the purpose of the practical investigation with a flashlight and a mirror?

    <p>To verify the law of reflection</p> Signup and view all the answers

    What can be inferred from the image shown in the Reflection Comparison diagram?

    <p>The rough surface scatters light in different directions</p> Signup and view all the answers

    What is the characteristic of the reflection that occurs on a smooth surface like a mirror?

    <p>The reflected rays are parallel and focused</p> Signup and view all the answers

    What is the main purpose of the normal line in understanding reflection?

    <p>To determine the point of incidence on the surface</p> Signup and view all the answers

    What is the relationship between the angle of incidence and the angle of reflection according to the law of reflection?

    <p>The angle of incidence is equal to the angle of reflection</p> Signup and view all the answers

    What is the term used to describe the ray of light that strikes a surface?

    <p>Incident ray</p> Signup and view all the answers

    What is the result of the incident ray hitting a smooth surface?

    <p>The light is reflected off the surface</p> Signup and view all the answers

    What is the role of the normal line in measuring angles of incidence and reflection?

    <p>It provides a reference point for measuring both angles of incidence and reflection</p> Signup and view all the answers

    What is an example of a situation where reflection of light can create a mirror image?

    <p>A still lake</p> Signup and view all the answers

    What is the term used to describe being at a 90-degree angle to a given line or surface?

    <p>Perpendicular</p> Signup and view all the answers

    What happens to the direction of light when it reflects off a surface?

    <p>It changes direction</p> Signup and view all the answers

    What is the primary reason for the difference in reflection between smooth and rough surfaces?

    <p>The uniformity of the surface structure</p> Signup and view all the answers

    What is the purpose of measuring the angles of incidence and reflection in the practical investigation?

    <p>To verify that the angles of incidence and reflection are equal</p> Signup and view all the answers

    What is the characteristic of the image formed by specular reflection from a smooth surface?

    <p>Clear and focused</p> Signup and view all the answers

    What is the role of the flashlight in the practical investigation?

    <p>To produce a parallel beam of light</p> Signup and view all the answers

    What can be inferred about the surface of still water from the Reflection Comparison diagram?

    <p>It can produce a clear and focused image</p> Signup and view all the answers

    What is the primary reason why a still lake can act as a mirror?

    <p>The lake's surface is smooth.</p> Signup and view all the answers

    What is the role of the normal line in measuring angles of incidence and reflection?

    <p>To provide a reference point for measuring angles.</p> Signup and view all the answers

    What is the relationship between the angle of incidence and the angle of reflection according to the law of reflection?

    <p>The angle of incidence is equal to the angle of reflection.</p> Signup and view all the answers

    What happens to the direction of light when it reflects off a surface?

    <p>It changes direction.</p> Signup and view all the answers

    What is the purpose of understanding reflection?

    <p>To study the properties of light.</p> Signup and view all the answers

    What is the characteristic of the normal line?

    <p>It is perpendicular to the surface.</p> Signup and view all the answers

    What is the result of the incident ray hitting a smooth surface?

    <p>The light is reflected.</p> Signup and view all the answers

    What is an example of a situation where reflection can create a mirror image?

    <p>A still lake.</p> Signup and view all the answers

    What is the main difference between specular reflection and diffuse reflection?

    <p>The clarity of the reflected image</p> Signup and view all the answers

    In the practical investigation, what is the purpose of shining the flashlight at different angles on the mirror?

    <p>To verify the law of reflection</p> Signup and view all the answers

    What is the characteristic of the surface of still water that allows it to act as a mirror?

    <p>It is smooth and uniform</p> Signup and view all the answers

    What can be observed when light reflects off a rough surface?

    <p>A diffuse and unclear image</p> Signup and view all the answers

    What is the purpose of measuring the angles of incidence and reflection in the practical investigation?

    <p>To verify the law of reflection</p> Signup and view all the answers

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