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COMEDK Ray and Wave Optics — practice questions — page 2

Explore 55 free Ray and Wave Optics questions in COMEDK Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Ray and Wave Optics questions and exercises with answers

Showing questions 31–55 of 55.

Tap every example of total internal reflectionRead the answer and worked solution →Critical angleRead the answer and worked solution →True or false: optical fibresRead the answer and worked solution →Match each formula to what it describesRead the answer and worked solution →Converging or diverging?Read the answer and worked solution →Complete the definition of lens powerRead the answer and worked solution →Lenses in contactRead the answer and worked solution →Order the steps: solve a mirror problemRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Match each instrument to its magnifying powerRead the answer and worked solution →True or false: optical instrumentsRead the answer and worked solution →Which instrument does this belong to?Read the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Tap every statement true of refractionRead the answer and worked solution →Complete the prism relationRead the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Reading the laws backRead the answer and worked solution →Order the reasoning: why an optical fibre worksRead the answer and worked solution →True or false: mirrors and lensesRead the answer and worked solution →Assertion and reason: instrumentsRead the answer and worked solution →Which quantity is being described?Read the answer and worked solution →Reflection or refraction?Read the answer and worked solution →True or false: opticsRead the answer and worked solution →

Worked practice questions

Tap every example of total internal reflection

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Questions
  1. Items
    1. Text
      Sparkle of a diamond
      Matches the category
      Yes
    2. Text
      A totally reflecting prism
      Matches the category
      Yes
    3. Text
      A mirage on a hot road
      Matches the category
      Yes
    4. Text
      Light guided along an optical fibre
      Matches the category
      Yes
    5. Text
      A rainbow forming in mist
      Matches the category
      No
    6. Text
      A shadow cast by a wall
      Matches the category
      No
    Category
    An example of TOTAL INTERNAL REFLECTION
Your syllabus's own list: diamond's sparkle, totally reflecting prisms, mirage and optical fibres. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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Critical angle

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Questions
  1. Question
    At the critical angle, the angle of refraction is
    Choices
    1. 0°
    2. 45°
    3. 90°
    Correct choice
    90°
  2. Question
    Total internal reflection occurs when i is
    Choices
    1. greater than the critical angle
    2. less than the critical angle
    3. exactly zero
    Correct choice
    greater than the critical angle
  3. Question
    The critical angle of diamond is about
    Choices
    1. 48.8°
    2. 24.4°
    3. 90°
    Correct choice
    24.4°
  4. Question
    Total internal reflection requires light to travel
    Choices
    1. rarer to denser
    2. through a vacuum
    3. denser to rarer
    Correct choice
    denser to rarer
At the critical angle the refracted ray grazes the surface at 90°. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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True or false: optical fibres

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Questions
  1. Statement is true
    Yes
    Statement
    An optical fibre is coated with a material of lower refractive index.
  2. Statement is true
    Yes
    Statement
    Light emerges from the far end even if the fibre is bent.
  3. Statement is true
    Yes
    Statement
    Optical fibres work by repeated total internal reflection.
  4. Statement is true
    No
    Statement
    The coating has a higher refractive index than the core.
  5. Statement is true
    No
    Statement
    A bent fibre loses the light out of its side.
The coating must have a LOWER refractive index, which is what keeps the light trapped even round a bend. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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