Gr 8 Natural Sciences Ch 3.4: Refraction of light

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Questions and Answers

What happens to light as it passes from air to water and back to air when a straw is placed in a glass of water?

  • It changes color
  • It speeds up
  • It stops
  • It bends (correct)

What is the term for the splitting of white light into its component colors?

  • Refraction
  • Dispersion (correct)
  • Reflection
  • Diffraction

What is the purpose of a converging lens?

  • To bend light rays inward to a focal point (correct)
  • To spread light rays apart
  • To change the color of light
  • To block light

What type of lens is used to correct near-sightedness?

<p>Diverging lens (B)</p> Signup and view all the answers

What is the term for the bending of light as it passes through a medium?

<p>Refraction (D)</p> Signup and view all the answers

What is the purpose of a diverging lens?

<p>To spread light rays apart (D)</p> Signup and view all the answers

What is the term for the process by which light is split into its component colors?

<p>Dispersion (D)</p> Signup and view all the answers

What is the term for a lens that bends light rays inward to a focal point?

<p>Converging lens (B)</p> Signup and view all the answers

What is the main reason for the bending of light as it passes from one medium to another?

<p>The change in speed of light in different media (B)</p> Signup and view all the answers

What is the term for a measure of how much a medium can slow down light?

<p>Optical density (B)</p> Signup and view all the answers

Why does a pencil in a glass of water appear bent?

<p>Because of the refraction of light (D)</p> Signup and view all the answers

What happens to light as it enters a denser medium?

<p>It slows down (D)</p> Signup and view all the answers

What is the term for the substance through which light travels?

<p>Medium (C)</p> Signup and view all the answers

Why does a straw appear bent in water?

<p>Because light changes direction as it moves from water to air (A)</p> Signup and view all the answers

What happens to light as it exits a denser medium into a less dense medium?

<p>It bends away from the normal line (A)</p> Signup and view all the answers

Why do legs appear shorter when viewed from above in a pool?

<p>Because of the refraction of light (A)</p> Signup and view all the answers

What happens to light when it passes through a prism?

<p>It is split into its component colors (C)</p> Signup and view all the answers

What is the main difference between a converging lens and a diverging lens?

<p>The direction in which they bend light rays (A)</p> Signup and view all the answers

What is the purpose of corrective lenses in glasses?

<p>To correct vision by refracting light (D)</p> Signup and view all the answers

What is the cause of a rainbow?

<p>The refraction and dispersion of light through a raindrop (A)</p> Signup and view all the answers

What is the purpose of lenses in optical devices such as microscopes and telescopes?

<p>To magnify or focus light (D)</p> Signup and view all the answers

What is an example of a natural phenomenon that demonstrates refraction and dispersion?

<p>A rainbow (B)</p> Signup and view all the answers

What is the term for the bending of light as it passes from one medium to another?

<p>Refraction (A)</p> Signup and view all the answers

What is the purpose of a converging lens in a telescope?

<p>To focus light rays inward to a focal point (B)</p> Signup and view all the answers

What is the main reason why light travels at different speeds in different media?

<p>Because of the difference in the optical density of the media (D)</p> Signup and view all the answers

What happens to the light ray when it enters a denser medium at an angle?

<p>It bends towards the normal line (C)</p> Signup and view all the answers

What is the reason why a straw appears bent in water?

<p>Because light changes direction as it moves from water to air (C)</p> Signup and view all the answers

What happens to the light ray when it exits a denser medium into a less dense medium?

<p>It bends away from the normal line (D)</p> Signup and view all the answers

What is the relationship between the density of a medium and its optical density?

<p>A medium with higher density has higher optical density (C)</p> Signup and view all the answers

What is the result of the refraction of light when a pencil is placed in a glass of water?

<p>The pencil appears bent (D)</p> Signup and view all the answers

What is the purpose of performing an experiment with a glass block?

<p>To demonstrate the concept of refraction (B)</p> Signup and view all the answers

What is the reason why legs appear shorter when viewed from above in a pool?

<p>Because light changes direction as it moves from water to air (D)</p> Signup and view all the answers

What is the primary reason for the observation of refraction in a straw placed in a glass of water?

<p>Light travels at different speeds in air and water (B)</p> Signup and view all the answers

Which of the following is an example of dispersion?

<p>A rainbow (A)</p> Signup and view all the answers

What is the main function of corrective lenses in glasses?

<p>To correct vision by refracting light (A)</p> Signup and view all the answers

Why do different colors of light bend by different amounts when passing through a prism?

<p>Because of their different wavelengths (D)</p> Signup and view all the answers

What is the purpose of a converging lens in an optical device such as a microscope?

<p>To magnify objects (D)</p> Signup and view all the answers

What is the term for the process by which light is refracted as it passes from one medium to another?

<p>Refraction (D)</p> Signup and view all the answers

Why does a converging lens focus light rays inward?

<p>Because it has a convex shape (C)</p> Signup and view all the answers

What is the main reason why a diverging lens is used to correct near-sightedness?

<p>Because it spreads light rays apart (C)</p> Signup and view all the answers

What is the primary reason why light travels at different speeds in different media?

<p>Due to the variation in the density of the media (A)</p> Signup and view all the answers

What is the relationship between the optical density of a medium and its ability to slow down light?

<p>The more optically dense the medium, the slower the light travels (D)</p> Signup and view all the answers

What is the result of the refraction of light when it passes from a denser medium to a less dense medium?

<p>The light bends away from the normal line (A)</p> Signup and view all the answers

What is the purpose of performing an experiment with a glass block?

<p>To demonstrate the process of refraction (B)</p> Signup and view all the answers

What is the reason why a pencil in a glass of water appears bent?

<p>Because of the refraction of light as it passes from water to air (D)</p> Signup and view all the answers

What is the relationship between the density of a medium and its ability to bend light?

<p>The more dense the medium, the more it bends light (B)</p> Signup and view all the answers

Why does a straw appear bent in water?

<p>Because of the refraction of light as it passes from water to air (A)</p> Signup and view all the answers

What is the result of the refraction of light when it passes from a less dense medium to a denser medium?

<p>The light bends towards the normal line (A)</p> Signup and view all the answers

What happens to white light as it passes through a prism?

<p>It splits into its component colors (C)</p> Signup and view all the answers

What is the main purpose of a converging lens in optical devices?

<p>To focus light rays inward (A)</p> Signup and view all the answers

What is the main reason for the formation of a rainbow?

<p>Dispersion of light through a raindrop (D)</p> Signup and view all the answers

What is the main difference between a converging lens and a diverging lens?

<p>Direction of bending (B)</p> Signup and view all the answers

What is the purpose of corrective lenses in glasses?

<p>To correct vision by focusing or dispersing light (B)</p> Signup and view all the answers

What is the term for the bending of light as it passes from one medium to another?

<p>Refraction (C)</p> Signup and view all the answers

What is the primary reason why different colors of light bend by different amounts when passing through a prism?

<p>Due to their different wavelengths (B)</p> Signup and view all the answers

What is an example of a natural phenomenon that demonstrates refraction and dispersion?

<p>Rainbow (D)</p> Signup and view all the answers

What happens to the speed of light as it travels from air to a denser medium?

<p>It decreases. (C)</p> Signup and view all the answers

What is the primary reason for the bending of light as it passes from one medium to another?

<p>The change in speed of light. (C)</p> Signup and view all the answers

What is the relationship between the density of a medium and its optical density?

<p>They are directly proportional. (B)</p> Signup and view all the answers

What happens to the light ray when it exits a denser medium into a less dense medium?

<p>It bends away from the normal line. (A)</p> Signup and view all the answers

What is the purpose of performing an experiment with a glass block?

<p>To demonstrate the principles of refraction. (C)</p> Signup and view all the answers

What is the reason why legs appear shorter when viewed from above in a pool?

<p>The refraction of light as it moves from water to air. (D)</p> Signup and view all the answers

What is the characteristic of a medium that determines how much it can slow down light?

<p>Optical density. (A)</p> Signup and view all the answers

What is the result of the refraction of light when a pencil is placed in a glass of water?

<p>The pencil appears bent. (A)</p> Signup and view all the answers

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