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Indian Navy Pilot Optics — practice questions — page 2

Explore 34 free Optics questions in Indian Navy Pilot Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Optics questions and exercises with answers

Showing questions 31–34 of 34.

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

Order the reasoning: why an optical fibre works

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Steps
  1. The core glass is denser than its coating
  2. Light enters one end at a shallow angle to the wall
  3. It strikes the core-coating boundary above the critical angle
  4. It is totally internally reflected rather than refracted out
  5. Repeated reflections carry it to the far end, even round bends
Each step is needed; drop one and the light escapes. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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True or false: mirrors and lenses

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Questions
  1. Statement is true
    Yes
    Statement
    A mirror's focal length is about half its radius of curvature.
  2. Statement is true
    Yes
    Statement
    The mirror equation is 1/v + 1/u = 1/f.
  3. Statement is true
    Yes
    Statement
    The thin lens formula is 1/v − 1/u = 1/f.
  4. Statement is true
    No
    Statement
    The mirror equation and lens formula have identical signs.
  5. Statement is true
    Yes
    Statement
    The lens maker's formula uses both radii of curvature.
The relations between f, R and the type of element. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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Assertion and reason: instruments

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Questions
  1. Reason
    Its magnifying power is f₀ divided by fₑ.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    A telescope needs a long focal length objective for high magnification.
  2. Reason
    It multiplies the objective and eyepiece magnifications together.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    A compound microscope out-magnifies a simple one.
  3. Reason
    Dispersion splits white light into its colours.
    Verdict
    Both are true; the reason does not explain the assertion.
    Assertion
    The dioptre is the SI unit of lens power.
The last round pairs two true halves that do not explain one another. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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