Reflection in Physics

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Questions and Answers

Which type of reflection occurs when light hits a rough surface?

  • Refraction
  • Total Internal Reflection
  • Diffuse Reflection (correct)
  • Specular Reflection

What is the definition of reflection in the context of light waves?

  • The refraction of a light wave as it passes through a medium
  • The change in direction of a light wave when it hits a surface and bounces back (correct)
  • The absorption of a light wave by a surface
  • The change in direction of a light wave when it passes through a medium

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

  • The angle of incidence is perpendicular to the angle of reflection
  • The angle of incidence is less than the angle of reflection
  • The angle of incidence is equal to the angle of reflection (correct)
  • The angle of incidence is greater than the angle of reflection

What is the orientation of the incident ray, reflected ray, and normal to the surface?

<p>They are coplanar (B)</p>
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What happens to the wavelength and frequency of light during reflection?

<p>They remain unchanged (A)</p>
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What is the application of reflection in telescopes and microscopes?

<p>To manipulate light (C)</p>
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What is the purpose of reflection in lighting fixtures and optical fibers?

<p>To control and direct light (B)</p>
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What is the characteristic of reflected light that may change depending on the surface properties?

<p>Intensity and amplitude (C)</p>
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Study Notes

Reflection

Definition Reflection is the change in direction of a light wave when it hits a surface and bounces back.

Types of Reflection

  • Specular Reflection: Occurs when light hits a smooth surface, resulting in a mirror-like reflection.
  • Diffuse Reflection: Occurs when light hits a rough surface, resulting in a scattered reflection.

Laws of Reflection

  1. The Angle of Incidence is Equal to the Angle of Reflection: The angle at which light hits a surface is equal to the angle at which it is reflected.
  2. The Incident Ray, Reflected Ray, and Normal are Coplanar: The incident ray, reflected ray, and normal to the surface all lie in the same plane.

Characteristics of Reflected Light

  • Wavelength and Frequency Remain Unchanged: The wavelength and frequency of the reflected light are the same as the incident light.
  • Intensity and Amplitude May Change: The intensity and amplitude of the reflected light may be different from the incident light, depending on the surface properties.

Applications of Reflection

  • Mirrors and Optics: Reflection is used in mirrors, telescopes, and microscopes to manipulate light.
  • Lighting and Illumination: Reflection is used to control and direct light in various applications, such as lighting fixtures and optical fibers.

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