Online Shiksha

By Savita S. More

Maharashtra Board Class 9 Science Reflection of Light

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.

 

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