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- Category: Exam Questions
- #70238we know that white light has seven colors namely violet,indigo,blue,green,yellow,orange and red.
When ever light falls on an object, all the colors, except the color of that object, are absorbed by that object and the color corresponding to that object is reflected. When this falls on our eyes we can see the color of that object. This whole process uses the phenomenon of reflection of light.
For example consider a leaf it has green colored chlormphyll pigment , it absorbs all colors present in white light except green color, and green light is reflected, this light ray when touches our retina makes us sense that leaf is in green color.
All these kind of processess involve the phenomenon of reflection of light.
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Light has many properties such as.
Light has a dual nature. It can be considered as a packet of photons or matter or as a ray of light.
Reflection is defined as Bouncing back of light from a reflective surface due to absorption of light of a particular wavelength by the surface and reflecting the remaining wavelength.
Light as said has seven colors.
Violet has the least wavelength. Red has the highest wavelength.
Consider a real world example like.
A sunflower looks yellow to our eyes because of reflection.
The sunflower absorbs all the wavelengths of light except yellow. Hence the flower looks yellow to our eyes.
The wavelength of light ranges from 400nm to 800nm. Near ultraviolet to far infrared.
You can think many examples with the reflection of light.
One best example is blue color of sky and sea.
And orange color of sun during sunrise and sunset.
This was explained by rayleigh through his rayleigh scattering phenomenon.
- #70263To be straight forward and simple, reflection of light can be defined as bouncing back of unabsorbed light from the surface of that object.
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- #70685When light is traveling in one medium(for example air),incident on the surface of other medium(for example glass), part of light sent back to original medium (air) with same angle at which it is incident on the surface, this phenomenon is called as reflection.
In case of opaque surfaces part of light reflect and another part absorbs through the surface. In case transparent materials part refracts along with reflection and absorption.
The other part of light enter the other medium if it is transparent (glass)deviate from its original path, and travels with different velocity (if later medium is dense compare to previous velocity decreases)is called as refraction. Angle of refraction varies directly with the wavelength of light i.e. for violet angle of refraction is least as it's wave length is least in visible reason. Similarly for red whose wave length is highest angle of refraction is high for red.
The color of flower, sky or any object is not due to reflection but it is due to scattering of light.
Difference between scattering and reflection is, when light ray falls a stone, it appears from all direction if it light scattered from stone, But if it reflects stone will appear along one direction.
Live example reflected image from mirror. Scattering from real object.
Sky appears blue because during noon scattering is very less all colors except blue. Hence after high scattering from altitudes blue hits our eyes to give blue colour for sky. Similar effect takes place in sea water also.
In the morning because of least scattering of red and orange colour of sunlight they reach us after passing thick atmosphere and all other colours scatter in the atmosphere. Because least scattering effect, Red light is used for alert signal.
- #70693When light falls on an object it tends to bounce of the subject. The bouncing back of light as it strikes a surface is called reflection of light. Some objects reflect light by 100% while others do that in varying amounts.
- #70724No material exist in the universe which reflects 100%, of course if total internal reflection taken place in a medium of 100% pure and with 100% monochromatic light, then we get 100% reflection.
1. When light traveled from a medium to relatively rarer medium, if the angle of incidence is more than critical angle, then light reflects totally internally instead of giving refraction is called Total Internal reflection.
2. When light travels from a medium to relatively rarer medium at a particular angle of incidence the refracted light grazes on the surface of separating two media, this angle of incidence is called as critical angle.
3. Monochromatic light is one which contains only one wavelength.
4. Optical fibers are working on the principle of Total Internal Reflection. These are thin solid glass cylinders of highest purity through which light travels with minimum loss of intensity.
- #70740Light is electromagnetic radiation. When it falls on a surface its direction deviates or retraces. This is called reflection of light.
Visible light is a part of electromagnetic spectrum. Other kinds of light rays are X rays, gamma rays, etc. Difference in wavelength is a crucial factor as far as light rays are concerned.
Violet, Indigo, Blue, Green, Yellow and red are visible light. Wavelength increases from violet to red. Rate of reflection decreases from blue to red.
Same way ability to travel for long distance increases from blue to red. That is why red color alone is visible during sun set.
Substances used to reflect light is called reflectors. Mirror is an example for a good reflector. Their are some laws of reflection.
Ray of light that falls to the surface is called incident ray and ray of light reflected back is called reflected ray. Angle of incidence is equal to angle for reflection. Incident ray, reflected ray, and normal are always on the same plane. These are laws of reflection. Diagrammatic representation of law of reflection is attached. It will make idea more clear.
Hope the article was useful.
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- #75453Definition :
Reflection of light occurs when a wave encounters a surface or a boundary . That does not absorb the light and bounces away from that corresponding medium .
Reflected waves are neither transmitted nor absorbed by the surface or by the medium .
When a wave strikes a medium or surface it is called incident wave and when the wave reflects from that medium it is called reflecting wave .
Now we can put an imaginary line perpendicular to the point where the incident wave strikes . The line is called normal wave .
The angle between the normal wave and incident wave is called the angle of incidence .
The angle between the normal wave and reflecting wave is called the angle of reflection .
Generally Two types.
1. Regular reflection
2. Diffused reflection
1. Regular Reflection :
When the waves fall on a smooth surface . The angular difference between the normal wave and incident wave and the angular difference between the normal wave and reflecting wave is equal .
2. Diffused Reflection :
When the waves fall on a rough surface . The incident wave and the reflecting wave are not parallel to each other .
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