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Questions and Answers
What is the primary characteristic of reflection of light?
What is the primary characteristic of reflection of light?
What is the relationship between the angle of incidence and the angle of reflection?
What is the relationship between the angle of incidence and the angle of reflection?
Which type of reflection occurs when light falls on a rough surface?
Which type of reflection occurs when light falls on a rough surface?
What is the formula that relates the object distance, image distance, and focal length of a mirror?
What is the formula that relates the object distance, image distance, and focal length of a mirror?
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What is the characteristic of the image formed by a plane mirror?
What is the characteristic of the image formed by a plane mirror?
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What is the relationship between the distance of the image from the mirror and the distance of the object from the mirror?
What is the relationship between the distance of the image from the mirror and the distance of the object from the mirror?
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Study Notes
Reflection of Light
What is Reflection of Light?
- The change in direction of light when it bounces back from a surface is called reflection of light.
- The bouncing back of light from a surface without being absorbed or transmitted is an example of reflection.
Laws of Reflection
- First Law: The incident ray, reflected ray, and normal to the mirror at the point of incidence lie in the same plane.
- Second Law: The angle of incidence is equal to the angle of reflection.
Types of Reflection
- Regular Reflection: Occurs when light falls on a smooth surface, resulting in a clear and sharp image. (e.g., mirror, still water)
- Irregular Reflection: Occurs when light falls on a rough surface, resulting in a blurred or distorted image. (e.g., rough paper, moving water)
Mirror Formula
- The relationship between the object distance, image distance, and focal length of a mirror is given by: 1 / f = 1 / do + 1 / di where f is the focal length, do is the object distance, and di is the image distance.
Characteristics of Image Formed by a Plane Mirror
- The image is virtual and erect.
- The image is of the same size as the object.
- The image is laterally inverted (i.e., left and right are reversed).
- The distance of the image from the mirror is equal to the distance of the object from the mirror.
Reflection of Light
What is Reflection of Light?
- Change in direction of light when it bounces back from a surface.
- Light bounces back from a surface without being absorbed or transmitted.
Laws of Reflection
- Incident ray, reflected ray, and normal to the mirror at the point of incidence lie in the same plane.
- Angle of incidence is equal to the angle of reflection.
Types of Reflection
Regular Reflection
- Occurs when light falls on a smooth surface.
- Results in a clear and sharp image.
- Examples: mirror, still water.
Irregular Reflection
- Occurs when light falls on a rough surface.
- Results in a blurred or distorted image.
- Examples: rough paper, moving water.
Mirror Formula
- Relationship between object distance, image distance, and focal length of a mirror: 1 / f = 1 / do + 1 / di
Characteristics of Image Formed by a Plane Mirror
- Image is virtual and erect.
- Image is of the same size as the object.
- Image is laterally inverted (left and right are reversed).
- Distance of image from the mirror is equal to distance of object from the mirror.
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Description
Understand the concept of reflection of light, including the laws of reflection and how it occurs when light bounces back from a surface.
