What is Light?
Light is a form of energy, which induces the sensation of vision in our eyes and makes us able to see various things present in our surroundings. Under ordinary situations, light travels in a straight line. The straight line followed by light is called Light-ray.
The light ray may be the object's self light (luminous object) or reflected light (non-luminous object).
Luminous Objects: The objects which can emit light on their own. Eg., Sun, Bulb, Tubelight, etc.
Non-Luminous Objects: The objects which cannot emit light on their own. They reflect light from other sources. Eg., Moon, Painting, etc.
7 Most Important Properties of Light:
- Reflection
- Refraction
- Dispersion
- Scattering
- Diffraction
- Interference
- Polarization
Nature/Characteristics of Light:
- Light is a form of energy
- It is an electromagnetic wave (EM wave)
- It propagates in a straight line
- It is a transverse wave that does not need any medium to travel. It can travel through a vacuum with a speed of 3×108 m/s.
- The velocity of the lightwave changes from one medium to another medium during its propagation.
- The wavelength of light changes from one medium to another medium whereas its frequency remains the same in all the media.
Significance/Importance of Light:
Light may be classified as Natural Light and Artificial Light. In this era, especially human beings cannot imagine their life without light. Light plays an important role in the life all the living creatures present in our planet.
Importance of Natural Light: Sunlight
- The significance of sunlight could be understand by the photosynthesis process takes place in plants. As plants synthesize nutrients from light and filter the air by consuming carbondioxide and releasing oxygen that we breathe. Hence everything depends on light.
- SunLight plays a key role in maintaining good health. The human being needs to be exposed to sunlight to regulate their body function properly. As we all
know that sunlight contains Vitamin D which is necessary to human body.
- The lack of sunlight can cause disturbance in the form of Vitamin D deficiency, Calcium deficiency, deregulate the release growth harmone. It can also impact the metabolism regulation and also cause fatigue and tiredness.
Importance of Artificial Light:
- Articial light helps in bringing energy to our home even in cloudy and rainy days, at night time.
- Artificial Lighting is very much essential and needful at home to create a pleasant atmosphere that helps to enjoy the life. During occasions light decoration enhances the beauty of that place.
- Now a days, wearing blue light glasses is getting popular as they reduces the risk of eye problems during the usage of smartphones and computers.
