Mirror
Introduction
In physics, a mirror is an object with a surface that reflects light in a way that preserves much of its original quality. Mirrors are essential in various optical devices and have significant applications in daily life and scientific research.
Types of Mirrors
There are two primary types of mirrors: concave and convex.
Concave Mirrors
Concave mirrors are curved inward and can form real or virtual images, depending on the object's position relative to the mirror. They are commonly used in telescopes, satellite dishes, and shaving mirrors.
Convex Mirrors
Convex mirrors are curved outward and always produce virtual images. They are often used in security mirrors, vehicle side-view mirrors, and magnifying glasses.
Reflection in Mirrors
When light strikes a mirror, it undergoes reflection, where the angle of incidence (the angle at which the light hits the mirror) is equal to the angle of reflection (the angle at which the light bounces off the mirror).
Study Guide
Key Concepts
- Understand the difference between concave and convex mirrors.
- Learn the properties of images formed by concave and convex mirrors.
- Master the laws of reflection and their application to mirror surfaces.
- Explore the applications of mirrors in various optical devices and everyday life.
Practice Problems
1. A concave mirror has a focal length of 10 cm. If an object is placed 20 cm from the mirror, determine the image distance and type of image formed.
2. Explain why convex mirrors are used as rear-view mirrors in vehicles.
3. Describe the formation of an image in a concave mirror when the object is placed between the focal point and the mirror.
Further Reading
1. The Physics Classroom: Reflection and the Ray Model of Light
2. School for Champions: Different Types of Reflection
