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PUCET (Punjab) Ray Optics and Optical Instruments — practice questions — page 3

Explore 78 free Ray Optics and Optical Instruments questions in PUCET (Punjab) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Ray Optics and Optical Instruments questions and exercises with answers

Showing questions 61–78 of 78.

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 →

Worked practice questions

Complete the definition of lens power

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Missing parts
  1. Answer
    1/f
    Choices
    1. 1/f
    2. f
    3. f²
  2. Answer
    dioptre
    Choices
    1. dioptre
    2. watt
    3. lumen
  3. Answer
    1 m⁻¹
    Choices
    1. 1 m⁻¹
    2. 1 m
    3. 1 cm⁻¹
Complete the statement
The power of a lens is {0}. Its SI unit is the {1}, and 1 D equals {2}.
Power is just the reciprocal of the focal length, in metres. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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Lenses in contact

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Questions
  1. Question
    For thin lenses in contact, the powers
    Choices
    1. add
    2. multiply
    3. subtract
    Correct choice
    add
  2. Question
    For thin lenses in contact, the reciprocals of focal length
    Choices
    1. multiply
    2. add
    3. cancel
    Correct choice
    add
  3. Question
    The focal length of a mirror is about
    Choices
    1. twice the radius
    2. equal to R
    3. half the radius of curvature
    Correct choice
    half the radius of curvature
  4. Question
    Dispersion is
    Choices
    1. splitting light into its colours
    2. bending at a surface
    3. reflection inside a medium
    Correct choice
    splitting light into its colours
Focal lengths combine as reciprocals powers simply add. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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Order the steps: solve a mirror problem

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Steps
  1. Fix the direction of the incident light as positive
  2. Measure every distance from the pole of the mirror
  3. Attach signs to u and f by that convention
  4. Substitute into 1/v + 1/u = 1/f
  5. Read the sign of v to decide whether the image is real or virtual
The sign convention comes before the arithmetic, which is the whole lesson. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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