Class 9 Physics: Reflection of Light Quiz
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Questions and Answers

Which surface of a plane mirror reflects most of the light incident on it?

  • The front smooth surface
  • The back silvered surface (correct)
  • Both surfaces reflect equally
  • The bottom surface

    • What is a plane mirror?

  • A mirror with a concave surface
  • A mirror made of tinted glass
  • A highly polished and smooth reflecting surface made from clear plane glass sheet (correct)
  • A mirror with a rough reflecting surface

    • What is an incident ray?

  • The light ray that refracts upon contact with a surface
  • The light ray that strikes a reflecting surface (correct)
  • The light ray that passes through a transparent medium
  • The light ray that reflects from the surface

    • What is the definition of reflection of light?

    <p>When light reverts to the same medium after striking a surface (A)</p> Signup and view all the answers

    What is the angle of incidence?

    <p>The angle which the incident ray makes with the normal at the point of reflection (D)</p> Signup and view all the answers

    What is the reflected ray?

    <p>The light ray that reflects from the surface (A)</p> Signup and view all the answers

    What is the angle of reflection denoted by?

    <p>r (C)</p> Signup and view all the answers

    What type of reflection is observed when light falls on a smooth and polished surface?

    <p>Regular reflection (C)</p> Signup and view all the answers

    Which law of reflection states that the incident ray, the reflected ray, and the normal at the point of incidence all lie in the same plane?

    <p>Second law (B)</p> Signup and view all the answers

    What type of reflection is observed when light falls on a rough surface?

    <p>Irregular reflection (D)</p> Signup and view all the answers

    What angle is equal to the angle of reflection according to the laws of reflection?

    <p>Angle of incidence (A)</p> Signup and view all the answers

    In an experiment to verify the laws of reflection, which line is drawn such that ∠MOA is lesser than 90°?

    <p>Line OA (B)</p> Signup and view all the answers

    What is used to verify the laws of reflection in the experiment described?

    <p>A plane mirror (D)</p> Signup and view all the answers

    Flashcards

    Plane mirror

    A highly polished, smooth reflecting surface made from a clear, flat glass sheet.

    Incident ray

    The ray of light that hits a reflecting surface.

    Reflected ray

    The light ray that bounces off a reflecting surface.

    Angle of incidence

    The angle between the incident ray and the normal at the point of reflection.

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    Angle of reflection

    The angle between the reflected ray and the normal at the point of reflection.

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    Regular reflection

    Reflection from a smooth, polished surface where all incident rays reflect in a single direction.

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    Irregular reflection

    Reflection from a rough surface where incident rays scatter in multiple directions.

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    Laws of reflection

    Rules that describe how light reflects from a surface.

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    First Law of Reflection

    The incident ray, reflected ray, and normal all lie in the same plane.

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    Second Law of Reflection

    The angle of incidence is equal to the angle of reflection.

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    Normal

    A line perpendicular to the reflecting surface at the point of incidence.

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    Point of incidence

    The point where the incident ray strikes the reflecting surface.

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    Back silvered surface

    The reflecting surface of a plane mirror, coated with a thin layer of silver.

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    Study Notes

    Plane Mirrors and Reflection

    • A plane mirror is a flat mirror with a smooth surface that reflects light.
    • The front surface of a plane mirror reflects most of the light incident on it.

    Light Rays and Reflection

    • An incident ray is a light ray that falls on a surface.
    • Reflection of light is the change in direction of light when it bounces back from a surface.
    • The angle of incidence is the angle at which an incident ray hits a surface.

    Reflected Ray and Angle of Reflection

    • The reflected ray is the light ray that bounces back from a surface after reflection.
    • The angle of reflection is the angle at which the reflected ray bounces back from a surface, denoted by θr.

    Types of Reflection

    • Specular reflection is observed when light falls on a smooth and polished surface, resulting in a clear and undistorted image.
    • Diffuse reflection is observed when light falls on a rough surface, resulting in a scattered and distorted image.

    Laws of Reflection

    • The law of reflection states that the incident ray, the reflected ray, and the normal at the point of incidence all lie in the same plane.
    • According to the laws of reflection, the angle of incidence is equal to the angle of reflection (θi = θr).

    Experiment to Verify Laws of Reflection

    • In an experiment to verify the laws of reflection, a line AO is drawn such that ∠MOA is lesser than 90°.
    • A plane mirror and a ruler are used to verify the laws of reflection in the experiment.

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    Description

    Test your knowledge of reflection of light with this quiz covering concepts like the definition of reflection, the surfaces of plane mirrors, and the laws of reflection.

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