Reflection of Light Concepts
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Questions and Answers

Which statement about the laws of reflection is true?

  • The angle of incidence is always zero.
  • The angle of incidence is always greater than the angle of reflection.
  • The angle of incidence is equal to the angle of reflection. (correct)
  • The incident ray, reflected ray, and normal lie in different planes.

    • What is the term for the angle formed between the incident ray and the normal at the point of incidence?

  • Angle of incidence (correct)
  • Normal angle
  • Angle of reflection
  • Plane of incidence

    • If a light ray is incident normally on a plane mirror, what will be the angle of reflection?

  • 180°
  • 90°
  • 45°
  • 0° (correct)

    • In the context of image formation, what distinguishes a real image from a virtual image?

    <p>A real image is inverted and can be obtained on a screen.</p> Signup and view all the answers

    Which plane is formed by the incident ray and the normal?

    <p>Plane of incidence</p> Signup and view all the answers

    What type of image is formed by a convex mirror?

    <p>Erect image</p> Signup and view all the answers

    Which of the following statements about a plane mirror is incorrect?

    <p>The image can be displayed on a screen.</p> Signup and view all the answers

    What happens to light rays reflecting off a surface that creates a virtual image?

    <p>They diverge but appear to converge.</p> Signup and view all the answers

    What is the main purpose of reflection of light in our daily lives?

    <p>To enable us to see different objects around us</p> Signup and view all the answers

    Which of the following describes irregular reflection?

    <p>Light beams spread in multiple directions</p> Signup and view all the answers

    What is the incident ray?

    <p>The ray striking the reflecting surface</p> Signup and view all the answers

    In which situation is regular reflection most likely to occur?

    <p>On a plane mirror</p> Signup and view all the answers

    What happens to light rays when they strike a rough surface?

    <p>They are reflected in multiple directions</p> Signup and view all the answers

    Why can we see objects around us even from different angles?

    <p>Because of irregular reflection spreading light</p> Signup and view all the answers

    What is the point of incidence?

    <p>The location on the surface where light hits</p> Signup and view all the answers

    Which type of reflection would occur on a non-polished, ordinary surface?

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

    Study Notes

    Reflection of Light

    • Light returns to its original medium after striking a surface
    • Some light may also be absorbed or transmitted depending on the surface
    • We see objects because light reflects off them and enters our eyes

    Kinds of Reflection

    • Regular reflection: Occurs when a beam of light strikes a smooth, polished surface like a plane mirror.

      • The reflected beam is parallel and in a fixed direction
      • Can only be seen from a specific direction

    • Irregular reflection: Occurs when light strikes a rough or uneven surface like a wall or book page

      • Light reflects in different directions at different points on the surface
      • Creates diffused or irregular reflection
      • Can be seen from anywhere
    • Incident ray: The light ray striking a reflecting surface
    • Point of incidence: The point where the incident ray strikes the reflecting surface
    • Reflected ray: The light ray that bounces off the surface, traveling back into the same medium as the incident ray
    • Normal: A line drawn perpendicular to the reflecting surface at the point of incidence
    • Angle of incidence: The angle between the incident ray and the normal
    • Angle of reflection: The angle between the reflected ray and the normal
    • Plane of incidence: The plane containing the incident ray and the normal
    • Plane of reflection: The plane containing the reflected ray and the normal

    Laws of Reflection

    • The angle of incidence (i) is equal to the angle of reflection (r)
    • The incident ray, the reflected ray, and the normal at the point of incidence all lie in the same plane

    Reflection of a Ray of Light Normally Incident on a Plane Mirror

    • When a ray of light is incident normally (i = 0°), the angle of reflection is also 0° (r = 0°)
    • The light ray retraces its path

    Formation of Images by Reflection

    • Real image: Can be obtained on a screen, is inverted, formed when light rays actually intersect after reflection.

      • Example: the image of a distant object formed by a concave mirror is a real image

    • Virtual image: Cannot be obtained on a screen, is erect, formed when light rays after reflection appear to diverge from the image.

      • Example: the image of an object formed by a plane mirror or a convex mirror is a virtual image

    • How we see virtual images: Divergent rays from the image enter our eyes and converge on our retina, creating the image we see.

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    Related Documents

    Class 9 ICSE Physics: Reflection of Light PDF

    Description

    This quiz explores the fundamental concepts of reflection of light, including regular and irregular reflection. Understand how light interacts with surfaces, and the terminology associated with this phenomenon. Perfect for students studying optics and light behavior.

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