Tag: newton's colour disc

Questions Related to newton's colour disc

How many colours comprises white light?

newton's colour disc light and the formation of shadows physics

  1. infinite

  2. seven

  3. three

  4. fourteen

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Correct Option: B
Explanation:

White light comprises of seven colours- Violet, Indigo, Blue. Green, Yellow, Orange , Red. 

So, when white light consisting  of seven colors falls on a transparent medium (glass prism) , each color in it is refracted ( or deviated ) by a different angle , with the result that seven colors are spread out to form a spectrum, The red color is deviated least , so it forms the upper part of the spectrum . On the other hand, violet color is deviated the maximum, so violet appears at the bottom of the spectrum.

Monochromatic light is that light in which :

newton's colour disc light and the formation of shadows physics

  1. yellow and red light is present

  2. various wavelengths are present

  3. red and violet light is present

  4. single wavelength is present

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Correct Option: D
Explanation:

Chromatic is something related to color. So "monochromatic" means a single color, which means light of single wavelength. 
Hence correct answer is D.

Which of the following sources of light is different from others ?

newton's colour disc light and the formation of shadows physics

  1. Sunlight

  2. White light

  3. Light from a bulb

  4. Sodium light

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Correct Option: D
Explanation:

$Answer:-$ D option

Sunlight,white light , light from bulb when passed from prism will split into its constituent colours,i.e. spectrum will be seen.
But when sodium light is passed it will not show colour band since it is a monochromatic light(light having only one constituent colour). 

_________ discovered that white light consists of seven colours.

newton's colour disc light and the formation of shadows physics

  1. Walt Disney

  2. Frank Starling

  3. Laplace

  4. Sir Isaac Newton

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Correct Option: D
Explanation:

Sir Isaac Newton in 1666 discovered that light consists of seven colours.

What are the components of sunlight:

newton's colour disc light and the formation of shadows physics

  1. Violet,red,yellow,white,magenta,purple,silver

  2. Violet,blue,green,red,indigo,yellow,orange

  3. Red,yellow,black,orange,silver,violet,blue

  4. Can't be determined

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Correct Option: B
Explanation:

Sunlight is reffered as white light.It consist of seven colours,i.e VIBGYOR

Primary colours of light are:

newton's colour disc light and the formation of shadows physics

  1. red, yellow, blue

  2. blue, orange, green

  3. red, blue, green

  4. all colours

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Correct Option: C
Explanation:

Red, blue and green are known as the three primary colours. Those are often regarded as basic colours in nature. By mixing these colours in different proportions, all other colours may be obtained.

What are composite colours?

newton's colour disc light and the formation of shadows physics

  1. Colours produced by mixing two or more primary colours, in proper proportions.

  2. Colours which combine easily with primary colours

  3. Tertiary colours when mixed in proper proportions

  4. None of these

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Correct Option: A
Explanation:

Red,blue ,green are known as the three primary colours. By mixing these colours in different proportions, we get all other colours. The primary colours, when mixed in proper proportion, give us white light. Any other colour,produced by mixing two or more primary colours, in different proportions, is called a composite colour.

The middle colour in sunlight spectrum is:

newton's colour disc light and the formation of shadows physics

  1. yellow

  2. green

  3. blue

  4. orange

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Correct Option: B
Explanation:

As violet,indigo,blue,green,yellow,orange and red are the colours of the spectrum.Hence,green is the middle colour in sunlight spectrum.

____ is an example of a light having a spectrum of 7 colors.

newton's colour disc light and the formation of shadows physics

  1. Sunlight

  2. White light

  3. Both A and B

  4. None of these

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Correct Option: C
Explanation:

Isaac Newton was the first person to split sunlight into seven colors using a glass prism. When he tried to split the band of colors further using a second prism placed in the inverted position as compared to that of the first, he observed that the emergent ray was white colored. This gave him an idea that sunlight is made up of 7 colors and any other light that gives a spectrum similar to that of sunlight is often referred to as white light.

How many colored components does white light have?

newton's colour disc light and the formation of shadows physics

  1. 4

  2. 5

  3. 6

  4. 7

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Correct Option: D
Explanation:

The prism splits the incident white light into a band of 7 colors. The various colors seen in the band are arranged in a particular sequence of Violet, Indigo, Blue, Green, Yellow, Orange and Red (VIBGYOR).