Ass #7 - The Path that Light Travels
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Questions and Answers

What is the term used for the distance a light ray travels within a gemstone?

  • Critical Distance
  • Light Path
  • Reflection Distance
  • Path Length (correct)

    • Which phenomenon occurs when white light separates into its spectral colors within a gemstone?

  • Reflection
  • Diffraction
  • Dispersion (correct)
  • Refraction

    • How does the critical angle of diamond compare to that of grease?

  • Diamond's critical angle is smaller than grease's. (correct)
  • Diamond's critical angle is irrelevant to grease.
  • Both critical angles are equal.
  • Diamond's critical angle is larger than grease's.

    • What does 'brightness' in diamond refer to?

    <p>The amount of light that returns to the observer's eye.</p> Signup and view all the answers

    Which color of light has a higher refractive index in diamonds?

    <p>Violet light</p> Signup and view all the answers

    What is the effect of the cut grade on a diamond's appearance?

    <p>It impacts light performance attributes like fire and scintillation.</p> Signup and view all the answers

    Why do materials with higher refractive indices tend to have higher luster?

    <p>They reflect light more effectively.</p> Signup and view all the answers

    What attribute of diamond is described by the term 'fire'?

    <p>The optical phenomenon of light dispersion.</p> Signup and view all the answers

    Which characteristic is NOT considered a light performance attribute in diamonds?

    <p>Shape</p> Signup and view all the answers

    What effect does a larger critical angle have on light exiting a diamond?

    <p>It increases the chance of unnecessary light loss.</p> Signup and view all the answers

    What are the two main aspects evaluated under the grading system for a round brilliant diamond's cut?

    <p>Design and Craftsmanship</p> Signup and view all the answers

    Which light condition is most suitable for assessing a diamond's brightness and face-up pattern?

    <p>Daylight-equivalent Diffused Fluorescent Light</p> Signup and view all the answers

    How is the fire of a diamond evaluated in the grading process?

    <p>Using spot lighting to assess visible flashes</p> Signup and view all the answers

    What are the five possible cut grades assigned by the GIA Cut Grading System?

    <p>Excellent, Very Good, Good, Fair, Poor</p> Signup and view all the answers

    In terms of diamond grading, what does symmetry refer to?

    <p>The exactness of the finished gem's shape</p> Signup and view all the answers

    Which grading environment factor is NOT essential for consistent diamond grading?

    <p>High temperatures</p> Signup and view all the answers

    What does a diamond's 'brightness' rating depend on?

    <p>How lively the stone appears under fluorescent light</p> Signup and view all the answers

    Which of the following attributes is associated with the appearance of flashes of color emitted from a diamond?

    <p>Fire</p> Signup and view all the answers

    What is an important consideration when grading the craftsmanship of a diamond?

    <p>The polish and symmetry of the gem</p> Signup and view all the answers

    Which of these factors does NOT affect the appearance of a diamond under grading conditions?

    <p>The diamond's carat weight</p> Signup and view all the answers

    What does the term 'fire' refer to in the context of diamonds?

    <p>The rainbow colors visible when a diamond is moved under a light.</p> Signup and view all the answers

    Which factor does NOT influence the fire seen in a diamond?

    <p>The size of the diamond's carat weight.</p> Signup and view all the answers

    How does a diamond's cut design affect its color appearance?

    <p>It alters the path length of light, affecting absorption.</p> Signup and view all the answers

    What aspect of scintillation involves the distribution and size of bright and dark areas?

    <p>Pattern</p> Signup and view all the answers

    What is the highest luster description for transparent gemstones?

    <p>Adamantine</p> Signup and view all the answers

    Which of the following contributes to a diamond's scintillation?

    <p>The size and arrangement of facets.</p> Signup and view all the answers

    What method was employed to develop the GIA Cutting Grading system?

    <p>A light ray–tracing computer program.</p> Signup and view all the answers

    What effect does light striking from all angles have on a diamond's appearance?

    <p>It emphasizes brightness while suppressing fire.</p> Signup and view all the answers

    What includes the personal and regional preferences in the grading of diamonds?

    <p>Cut grade evaluation.</p> Signup and view all the answers

    What does a shortened path length in a diamond result in?

    <p>Less absorption and a lighter color.</p> Signup and view all the answers

    What occurs when light strikes a boundary between two materials?

    <p>Part of the light returns to the observer</p> Signup and view all the answers

    What does the law of reflection state?

    <p>The angle of incidence is equal to the angle of reflection</p> Signup and view all the answers

    What happens to light as it passes into a more refractive material?

    <p>It bends toward the normal</p> Signup and view all the answers

    What is the critical angle in total internal reflection?

    <p>The angle of incidence where light cannot escape further</p> Signup and view all the answers

    Which property measures how the speed and direction of light change in a material?

    <p>Refractive index</p> Signup and view all the answers

    What is the relationship between refractive index and optical density?

    <p>Higher refractive index indicates higher optical density</p> Signup and view all the answers

    What happens to the speed of light as it passes through tighter bonded materials, like diamond?

    <p>It dramatically slows down</p> Signup and view all the answers

    What defines the angle of refraction?

    <p>The angle between the normal and the refracted light</p> Signup and view all the answers

    When light is incident at an angle greater than the critical angle, what effect occurs?

    <p>Total internal reflection occurs</p> Signup and view all the answers

    What is the significance of the normal line in the context of reflection?

    <p>It acts as a reference for measuring angles of incidence and reflection</p> Signup and view all the answers

    Study Notes

    Reflection

    • Light striking a boundary between materials returns to the observer.
    • The angle of incidence equals the angle of reflection.
    • The normal is an imaginary line perpendicular to the surface.

    Angle of Incidence and Reflection

    • Incident light approaches the surface.
    • Reflected light returns to the observer.
    • Angles are measured between the normal and the light rays.

    Refraction

    • When light passes from one material to another, it may change speed and direction.
    • Optical density is a material's ability to slow down light.
    • Higher refractive index (RI) means greater slowing of light.

    Refractive Index (RI)

    • RI measures how light's speed and direction change in a material compared to in air.
    • Gem materials have an RI greater than 1 (air is assumed to be 1).
    • Higher RI means greater refractive ability.

    Speed of Light

    • Light's speed varies depending on the material.
    • The tightly bonded carbon atoms in diamonds dramatically slow light.

    Total Internal Reflection

    • Occurs when the angle of incidence increases to a point where the angle of refraction reaches 90 degrees.
    • Light cannot escape the material; it reflects back into the material.
    • Critical angle is the angle of incidence where TIR begins.
    • Materials with higher RI have smaller critical angles.

    Critical Angle

    • The angle at which total internal reflection begins.
    • Smaller critical angle means more incidence angles will initiate TIR.

    Dispersion

    • White light separates into its spectral colors.
    • Dispersion is a material's characteristic.
    • Violet light refracts more than red light (higher RI).

    Path Length

    • Total distance light travels in a gemstone.
    • Influences colour appearance due to light absorption.

    Light and Diamond Appearance

    • Brightness—amount of light returned to the observer; dependent on facets, and high luster.
    • Fire—rainbow colours produced by dispersion.
    • Scintillation—sparkle; influenced by cut, size, and arrangement of facets.

    GIA Cut Grading System

    • Categorizes round brilliant diamonds from D to Z colour.
    • Grades based on proportions, polish, and symmetry.
    • Uses standardized lighting to achieve consistent results.
    • Brightness, fire, and pattern are assessed by lighting variations.

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    Related Documents

    Ass #7: The Path Light Travels PDF

    Description

    Explore the fascinating concepts of light behavior in this quiz focusing on reflection and refraction. Understand the principles behind angles of incidence, reflection, and the refractive index. Test your knowledge on how light interacts with different materials and its speed in various substances.

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