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JEE Main Ray Optics and Optical Instruments — practice questions — page 2

Explore 88 free Ray Optics and Optical Instruments questions in JEE Main 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 31–60 of 88.

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 →Spot the one that does not belongRead the answer and worked solution →Assertion and reason: instrumentsRead the answer and worked solution →Complete the definition of lens powerRead the answer and worked solution →Tap every statement true of refractionRead 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 →Two are true, one is notRead the answer and worked solution →Complete the condition for total internal reflectionRead the answer and worked solution →Match each instrument to its magnifying powerRead the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →True or false: the sign conventionRead the answer and worked solution →A convex mirror always forms an image of a real object that is:Read the answer and worked solution →The critical angle for total internal reflection at a glass-air interface is $42^\circ$. The refractive index of the glass is approximately:Read the answer and worked solution →An object is placed 30 cm from a concave mirror of focal length 20 cm. The image distance isRead the answer and worked solution →

Worked practice questions

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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Assertion and reason

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Questions
  1. Reason
    Total internal reflection needs travel from a denser medium to a rarer one.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Light cannot be totally internally reflected going from air into glass.
  2. Reason
    Its coating has a lower refractive index, so light keeps reflecting internally.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    An optical fibre carries light around bends.
  3. Reason
    Focal length is roughly half the radius of curvature.
    Verdict
    The assertion is false and the reason is true.
    Assertion
    A concave mirror has a positive focal length.
  4. Reason
    Power is the reciprocal of focal length, and those reciprocals add.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Powers of lenses in contact simply add.
The reason must genuinely explain the assertion. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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Match each instrument to its magnifying power

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Matching pairs
  1. Left
    Simple microscope
    Right
    m = 1 + D/f
  2. Left
    Simple microscope, image at infinity
    Right
    m = D/f
  3. Left
    Compound microscope
    Right
    m = mₑ × m₀
The three magnification formulae the chapter gives. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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