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Questions and Answers
What is reflection?
What is reflection?
Reflection is a property of light that occurs when light bounces back as it hits a surface.
Differentiate regular reflection from diffused reflection.
Differentiate regular reflection from diffused reflection.
Regular reflection occurs on smooth surfaces where light rays are reflected in the same orientation, while diffused reflection occurs on rough surfaces where light is reflected in many directions.
What do plane mirrors do?
What do plane mirrors do?
The virtual image formed by a plane mirror is the same size as the real object.
The virtual image formed by a plane mirror is the same size as the real object.
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The angle of ______ is the same as the angle of incidence according to the law of reflection.
The angle of ______ is the same as the angle of incidence according to the law of reflection.
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Which of these is a type of mirror mentioned in the lesson?
Which of these is a type of mirror mentioned in the lesson?
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What happens when light strikes a rough surface?
What happens when light strikes a rough surface?
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What is reflection?
What is reflection?
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Differentiate regular reflection from diffused reflection.
Differentiate regular reflection from diffused reflection.
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The law of reflection states that the angle of reflection ($θ_r$) is equal to the angle of _____ ($θ_i$).
The law of reflection states that the angle of reflection ($θ_r$) is equal to the angle of _____ ($θ_i$).
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Which of the following is a characteristic of a virtual image formed by a plane mirror?
Which of the following is a characteristic of a virtual image formed by a plane mirror?
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The images formed by plane mirrors are laterally inverted.
The images formed by plane mirrors are laterally inverted.
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Match the following types of mirrors with their descriptions:
Match the following types of mirrors with their descriptions:
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Which of the following terms describes the bouncing back of light?
Which of the following terms describes the bouncing back of light?
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Study Notes
Reflection
- Reflection is the bouncing back of light when it strikes a surface.
- This allows us to see objects because light reflected from them enters our eyes.
- Objects can be light sources, such as the sun, stars, lamps, and bulbs, or they can reflect light from a source.
Law of Reflection
- The angle of reflection (θr) is equal to the angle of incidence (θi).
- Incident ray: incoming light ray.
- Reflected ray: light ray that bounces back from the surface.
- Normal line: a perpendicular line drawn to the surface at the point where the incident ray hits.
Types of Reflection
- Regular reflection: occurs when light hits a smooth surface, reflecting all light rays in the same direction.
- Diffused reflection: occurs when light hits a rough surface, reflecting light rays in many directions.
Image Formation for Reflecting Surfaces
- Mirrors are reflective surfaces made of glass.
- Plane mirrors are flat surfaces that reflect light.
- Curved mirrors are curved surfaces that reflect light.
Image Formation in Plane Mirrors
- Plane mirrors produce virtual, upright images that are the same size as the object.
- The image appears to be behind the mirror, at the same distance from the mirror as the object.
- Lateral inversion: The image is flipped left-to-right.
- To locate the image, use ray diagramming:
- Draw two rays from the object to the mirror.
- Extend the reflected rays behind the mirror to meet at the image location.
Checkpoint
- Reflection is the phenomenon where light bounces back from a surface.
- Regular reflection occurs when light hits a smooth surface and reflects in a single direction.
- Diffused reflection occurs when light hits a rough surface and reflects in multiple directions.
Reflection and Mirrors
- Reflection is the bouncing back of light when it hits a surface. We see objects because light reflects off them and into our eyes.
- Light sources can be natural (sun, stars) or artificial (lamps, bulbs).
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The Law of Reflection states that the angle of reflection is equal to the angle of incidence.
- Incident Ray: Light ray that strikes the surface.
- Reflected Ray: Light ray that bounces back from the surface.
- Normal Line: Imaginary line perpendicular to the surface at the point of incidence.
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Types of Reflection:
- Regular Reflection: Occurs when light reflects off a smooth surface, resulting in a clear, focused reflection.
- Diffused Reflection: Occurs when light reflects off a rough surface, scattering the light in multiple directions.
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Mirrors are reflective surfaces made of glass, used to form images.
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Plane mirrors have flat surfaces and produce virtual images (images that appear behind the mirror).
- The image distance (distance between the image and the mirror) is the same as the object distance (distance between the object and the mirror).
- The image size is the same as the object size but is laterally inverted (left and right are flipped).
- Curved mirrors have curved surfaces (concave or convex) and can produce both real and virtual images.
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Plane mirrors have flat surfaces and produce virtual images (images that appear behind the mirror).
- Virtual Image: An image that appears to be behind the mirror and cannot be projected onto a screen.
- Real Image: An image that can be projected onto a screen.
Image Formation in Plane Mirrors
- The image formed by a plane mirror is a virtual image.
- To trace the image formation in a plane mirror graphically:
- Locate the image behind the mirror using the distance rule.
- Draw two or more rays from the image to the observer's eye.
- Draw the incident rays on the object corresponding to those reflected rays.
Checkpoint Answers
- Reflection is the bouncing back of light when it hits a surface.
- Regular reflection occurs when light reflects off a smooth surface, resulting in a clear, focused reflection. Diffused reflection occurs when light reflects off a rough surface, scattering the light in multiple directions.
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Description
Explore the fundamental concepts of reflection, including the law of reflection and types of reflection. Understand how light interacts with various surfaces to form images, focusing on mirrors and their properties. This quiz is ideal for students learning optics in physics.
