Periscope, floodlights, shaving mirror, kaleidoscope, street lights, headlamps of a car. tabular form
Device | Type of Mirror Used |
Periscope | Plane mirror |
Floodlights | Concave mirror |
Shaving mirror | Concave mirror |
Kaleidoscope | Multiple plane mirrors |
Street lights | Convex mirror |
Headlamps of a car | Convex mirror |
Important Points
Introduction:
- Light is essential for perceiving our surroundings and enjoying natural wonders.
- Light is electromagnetic radiation, enabling vision.
Plane Mirrors:
- Reflective surfaces that create clear images are mirrors.
- Two types: plane mirrors and spherical mirrors.
- Plane mirrors reflect with regular reflection, producing clear images.
- Images in plane mirrors are laterally inverted but of the same size as the source.
Spherical Mirrors:
- Curved mirrors, concave (inner surface reflects) and convex (outer surface reflects).
- Concave mirrors are focusing mirrors, producing real images.
- Convex mirrors are dispersing mirrors, producing virtual and smaller images.
Determining Mirror Type:
- Concave mirrors magnify when close and diminish when distant.
- Convex mirrors produce erect and smaller images, regardless of distance.
Applications of Mirrors:
- Concave mirrors: Barber shops, dental hospitals, torches, floodlights, solar energy equipment.
- Convex mirrors: Car side mirrors, large mirrors at gates and squares.
Key Points-
The image in front of the mirror which can be obtained on a screen is called a real image.
The image which is behind the mirror and thus cannot be obtained on a screen is called a virtual image.
Radius of curvature : The radius of the sphere of which the mirror is a part, is called the radius of curvature of the mirror.
Focal length : The distance (f) between the pole and the principal focus of the mirror is called the focal length. This distance is half of the radius of curvature of the mirror.