3.5. Spectrum of White Light
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Questions and Answers

Why does white light separate into different colors when passing through a prism?

  • The prism emits its own light, which interferes with the white light and creates colors.
  • The prism acts as a filter, selectively reflecting different colors of light.
  • The prism absorbs certain colors while allowing others to pass through unaffected.
  • Each color has a different speed in the prism, leading to varying degrees of refraction. (correct)

In what order do the colors of the visible light spectrum appear, from least refracted to most refracted, when white light passes through a prism?

  • Red, orange, yellow, green, light blue, blue, purple (correct)
  • Purple, blue, light blue, green, yellow, orange, red
  • Green, yellow, orange, red, purple, blue, light blue
  • Red, yellow, green, blue, purple, orange, light-blue

Which phenomenon explains why a rainbow appears when sunlight interacts with raindrops?

  • Diffraction
  • Dispersion (correct)
  • Interference
  • Reflection

Imagine you are observing a rainbow. Where must the sun be positioned relative to you?

<p>Behind you, so that its light passes through the raindrops in front of you. (D)</p> Signup and view all the answers

Why is there no distinct line separating one color from another in the visible spectrum?

<p>The colors gradually transition from one wavelength to the next. (B)</p> Signup and view all the answers

Why does white light separate into different colors when it passes through a prism?

<p>Each color has a unique speed in the prism, causing varying degrees of refraction. (C)</p> Signup and view all the answers

During the 'Ylber në laborator' activity, what is the purpose of marking two points on the sheet of paper before removing the prism and light source?

<p>To record the initial path of the light beam and the position of the refracted red and violet rays for analysis. (B)</p> Signup and view all the answers

If a light beam is shone through a prism and the resulting spectrum is projected onto a screen, what change would be observed if the prism were rotated slightly?

<p>The spacing between the colors in the spectrum would change. (D)</p> Signup and view all the answers

Which statement accurately describes the relationship between the color of light and its degree of refraction in a prism?

<p>Violet light is refracted more than red light. (D)</p> Signup and view all the answers

Consider a scenario where white light is passed through two identical prisms placed in series, but oriented in opposite directions. What would be the most likely outcome?

<p>The light exiting the second prism would be white light again. (A)</p> Signup and view all the answers

Flashcards

What is white light?

White light is a combination of all colors in the spectrum.

What is light dispersion?

Separating white light into its component colors.

What is a prism?

A transparent object that can disperse white light.

What is refraction?

The bending of light as it passes from one medium to another.

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Which color refracts more?

Violet light bends the most, red light bends the least.

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Light Spectrum

The visible array of colors produced when white light is separated. Think ROYGBIV.

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Dispersion

The breakdown of white light into its constituent colors.

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Rainbow

An optical phenomenon caused by refraction, internal reflection, and dispersion.

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Colors of the Spectrum

Red, Orange, Yellow, Green, Light Blue, Blue, and Purple.

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Refraction

The bending of light as it passes from one transparent substance into another.

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Study Notes

Spectrum of white light

  • Rainbows often appear when it rains and the sun is shining simultaneously.
  • To see it, one must turn their back to the Sun.
  • Its rays penetrate the atmosphere laden with water droplets.
  • A bow with beautiful colors will appear opposite, which looks as if it is hanging in the air.

Light Decomposition

  • Besides in nature, rainbow colors can be obtained by passing a ray of white light through a glass prism, which is a glass block with a triangular shape.
  • When light penetrates the prismit, it is refracted.
  • During this process, the ray of white light decomposes into beams of colored light, creating what is called a spectrum.
  • These colors are the same as those of the rainbow.
  • The separation of white light into separate colors is called breakdown (dispersion).
  • The colors of the light spectrum always appear in the same order: red, orange, yellow, green, blue, indigo, violet.
  • Although there are seven colors in the spectrum, there is no dividing line where one color ends and the other begins.
  • Colors change gradually from one hue to another.

Explanation and breakdown of light

  • The spectrum appears when light passes through a glass prism.
  • Isaac Newton concluded that the rainbow colors result from the glass.
  • White light (such as sunlight) is a mixture of all the various colors of the spectrum
  • Breakdown of light happens Because of the refraction.
  • When white light enters a glass block, its component colors are refracted in varying amounts.
  • The violet color is refracted the most, while the red is refracted the least.
  • The different colors that make up white light scatter in different directions.
  • This is why they can be seen separately from one another.

Key Points

  • White light consists of all the colors of the spectrum, from red to violet.
  • White light can be broken down into other colors using a prism.
  • This phenomenon is called light breakdown or dispersion.
  • Breakdown happens because the colors of light refract at varied levels from each other.

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White light can be split into its constituent colors, like in a rainbow. This separation, called dispersion, occurs when light passes through a prism or water droplets. The colors always appear in the same order: red, orange, yellow, green, blue, indigo, and violet.

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