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We have already discussed about image formation in a pinhole camera and on a mirror.
Is there any difference in both of these images?
Yes, there is a difference in image formation by a pinhole camera and a plane mirror. Let us see the differences in the tabular column given below.
Real image | Virtual image |
| The images that can be captured on screen are called real images. | The images that cannot be captured on screen are called virtual images. |
| Real images are always inverted. | Virtual images are always upright. |
Example: The image formed on the pinhole camera and cinema screen.  | Example: The image formed on the plane mirror and concave lens.  |
Properties of images formed on a plane mirror
- The plane mirror always forms virtual and upright images.
- The object size and image size are always equal.
- The image distance from the plane mirror is equal to the distance of the object from the mirror.
- Images are laterally inverted.
Fun facts:
Is it possible to transfer information (data) from one place to another by using light rays?
Yes, we can use a device called optical fibre.
- Optical fibre works on the principle of 'total internal reflection'. By using optical fibre, we can transfer huge amount of data over a large distance.
- Optical fibre consists of a cable with thin, flexible fibres with a glass core through which light signals are sent.
- They can be twisted and bent easily.
- The data which is given to the optical fibres are in the form of pulses of light.
- The data which is given at the one end reaches the other with negligible losses.
- Optical fibres have become very important in high-speed communications, such as cable television and high-speed broadband services because we can transmit data very easily with negligible loss.
Working of optical fibres
Reference:
https://pixabay.com/vectors/cinema-movie-hollywood-concert-4398725/
https://pixabay.com/photos/fiber-optic-cable-blue-network-2749588/
https://commons.m.wikimedia.org/wiki/File:Optical_fiber_cable-06ASD.jpg
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