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Reflection Of Light quiz #2

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  • What type of image is formed in a plane mirror?
    A plane mirror forms a virtual image that is the same size as the object and appears behind the mirror.
  • As you walk away from a plane mirror on a wall, what happens to the height of your image?
    The height of your image remains the same as you walk away from a plane mirror.
  • What are the two main behaviors a wave can exhibit when it encounters a boundary between two media?
    A wave can either reflect off the boundary or transmit through it into the new medium. In practice, most waves do a combination of both.
  • How is the angle of incidence defined when discussing the reflection of light?
    The angle of incidence is measured relative to the normal, which is a line perpendicular to the boundary surface. This convention is important for applying the law of reflection.
  • What does the law of reflection state about the relationship between the incident and reflected angles?
    The law of reflection states that the angle of incidence equals the angle of reflection. Both angles are measured relative to the normal.
  • How does the reflection of light compare to a ball undergoing an elastic collision with a wall?
    Both processes involve the incoming and outgoing angles being equal relative to the normal. The analogy helps illustrate conservation of momentum and direction change.
  • What is the normal in the context of light reflection, and why is it important?
    The normal is a line perpendicular to the surface at the point of incidence. It is crucial because angles of incidence and reflection are always measured relative to it.
  • If a light ray strikes a surface at 65 degrees to the normal, what is the angle between the ray and the surface?
    The angle between the ray and the surface is 25 degrees because it is complementary to the 65-degree angle with the normal. The two angles add up to 90 degrees.
  • When solving for unknown angles in a triangle formed by incident and reflected rays, what geometric rule is used?
    The sum of the internal angles in a triangle must be 180 degrees. This rule allows calculation of unknown angles when the other two are known.
  • What must be true about the angle of reflection when a light ray encounters a second surface after reflecting from the first?
    The angle of reflection at the second surface must equal the angle of incidence at that surface, according to the law of reflection. This is determined relative to the normal of the second surface.
  • What is the term for when a wave, such as light, strikes an object and bounces off its surface?
    This phenomenon is called reflection. When a wave encounters a boundary between two media and bounces off rather than passing through, it is said to be reflected.