Reflection of Light
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Questions and Answers

What happens when light from the Sun hits an object that appears yellow?

  • It reflects all the light and appears white
  • It reflects yellow light and absorbs all the other colors (correct)
  • It absorbs all the yellow light and reflects the other colors
  • It absorbs all the light and appears black

    • What is the law of reflection?

  • The angle of incidence is greater than the angle of reflection
  • The angle of incidence is less than the angle of reflection
  • The angle of incidence has no relation to the angle of reflection
  • The angle of incidence is equal to the angle of reflection (correct)

    • What type of reflection occurs on a rough surface?

  • Multiple reflection
  • Regular reflection
  • Diffuse reflection (correct)
  • Specular reflection

    • What is the result of multiple reflections in two mirrors?

    <p>Multiple images are formed</p> Signup and view all the answers

    What is the formula for the law of reflection?

    <p>$$ heta_i = heta_r$$</p> Signup and view all the answers

    What is an example of specular reflection?

    <p>Reflection of a person in a mirror</p> Signup and view all the answers

    What is the number of images formed by multiple reflections in two mirrors?

    <p>It depends on the angle between the mirrors</p> Signup and view all the answers

    Why is reflection of light important in everyday life?

    <p>It is responsible for most things people see every day</p> Signup and view all the answers

    What happens to light rays when they encounter a surface or other boundary that does not absorb their energy?

    <p>They change direction</p> Signup and view all the answers

    What type of reflection occurs when light rays reflect from a smooth surface?

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

    What is the angle of incidence equal to in the law of reflection?

    <p>The angle of reflection</p> Signup and view all the answers

    Why do objects have different colors?

    <p>Because they reflect different wavelengths of light</p> Signup and view all the answers

    What type of reflection occurs when light rays reflect from a rough surface?

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

    What is the main reason why people see objects?

    <p>Because objects reflect light from another source</p> Signup and view all the answers

    What is the importance of reflection of light?

    <p>It is the basis for vision</p> Signup and view all the answers

    Study Notes

    Reflection of Light

    • Reflection of light occurs when light rays change direction after encountering a surface or other boundary that does not absorb the energy of the radiation.
    • The type of surface determines how light rays will be reflected differently.

    Law of Reflection

    • States that when light reflects off a plane surface, the angle of incidence will be equal to the angle of reflection.
    • Illustrated by the diagram showing a ray of light reflecting from a plane surface, with the angle of incidence and angle of reflection measured relative to the normal.
    • Mathematically represented as: ∠i = ∠r

    Types of Reflection

    • Specular Reflection:
      • Occurs on smooth surfaces like mirrors or polished metals.
      • Light rays are reflected in the same way, obeying the law of reflection.
      • Examples: person's reflection in a mirror, reflection of a mountain on still water, and reflection of light on polished metal surfaces.
    • Diffuse Reflection:
      • Occurs on rough surfaces like gravel or rough water.
      • Light rays are reflected at different angles due to surface roughness, causing them to scatter or spread out.
      • Examples: reflection of sunlight off sand or gravel, reflection of the moon on rough water, and reflection of lights off paper.

    Multiple Reflection

    • Occurs when there are multiple mirrors with an object between them.
    • Results in the formation of multiple images, with the number of images dependent on the angle between the mirrors.
    • Mathematically represented as: n = 360° / θ

    Reflection of Light Examples

    • Responsible for most things people see every day, such as:
      • Reflection in a mirror
      • Seeing objects outside during the day (reflection of sunlight)
      • Seeing the moon at night (reflection of light from the Sun)
    • Important for vision, as it allows people to see objects that either give off light or reflect light from another source.

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    Description

    Learn about the reflection of light, how it interacts with objects, and how it changes direction after encountering a surface or boundary. Understand the definition and types of reflection based on surface type.

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