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NEET UG Ray Optics and Optical Instruments — practice questions — page 3

Explore 170 free Ray Optics and Optical Instruments questions in NEET UG 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 61–90 of 170.

Assertion and reason: instrumentsRead the answer and worked solution →Which quantity is being described?Read the answer and worked solution →The angle of reflection is equal to the angle of:Read the answer and worked solution →The incident ray, the reflected ray and the normal all lie in:Read the answer and worked solution →Snell's law introduces a constant known as the:Read the answer and worked solution →The refractive index for a pair of media is independent of the:Read the answer and worked solution →If the refractive index is greater than one, the refracted ray bends:Read the answer and worked solution →In total internal reflection, transmission of light is:Read the answer and worked solution →In ordinary reflection, the reflected ray is always:Read the answer and worked solution →The critical angle is the angle of incidence for which refraction is:Read the answer and worked solution →The critical angle of water with respect to air is about:Read the answer and worked solution →The refractive index of water is:Read the answer and worked solution →The refractive index of diamond is:Read the answer and worked solution →The critical angle of diamond is about:Read the answer and worked solution →Crown glass has a refractive index of:Read the answer and worked solution →The SI unit for the power of a lens is the:Read the answer and worked solution →A lens of focal length one metre has a power of:Read the answer and worked solution →The power of a converging lens is:Read the answer and worked solution →A prescribed lens of power plus 2.5 D is a convex lens of focal length:Read the answer and worked solution →A lens of power minus 4.0 D is a concave lens of focal length:Read the answer and worked solution →In the visible spectrum, red light lies at the:Read the answer and worked solution →Violet light has a wavelength of about:Read the answer and worked solution →Dispersion happens because the refractive index differs with:Read the answer and worked solution →Which colour travels fastest in a glass prism?Read the answer and worked solution →Match each medium to its indexRead the answer and worked solution →Which has the bigger critical angleRead the answer and worked solution →Work out the lens powersRead the answer and worked solution →True or false on ray opticsRead the answer and worked solution →Converging or diverging lensRead the answer and worked solution →Fill the gaps on opticsRead the answer and worked solution →

Worked practice questions

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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Which quantity is being described?

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Items
  1. Item
    Critical angle i_c
    Category
    An angle
  2. Item
    Angle of minimum deviation
    Category
    An angle
  3. Item
    Focal length f
    Category
    A distance
  4. Item
    Radius of curvature R
    Category
    A distance
  5. Item
    Measured in dioptres
    Category
    A power
  6. Item
    Adds for lenses in contact
    Category
    A power
Categories
  1. Item
    An angle
  2. Item
    A distance
  3. Item
    A power
Critical angle, focal length and power are all single numbers describing very different things. Source: syllabus Physics Part II, Ch 9 Ray Optics and Optical Instruments.

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The angle of reflection is equal to the angle of:

  1. Incidence
  2. Emergence
  3. Divergence
  4. Deflection
Show answer and solution

Correct answer: A. Incidence

1. Both angles are measured from the normal to the surface. 2. The angle of reflection equals the angle of incidence. 3. So the correct answer is incidence. _Source: syllabus Physics Part II, Ch 9 'Ray Optics and Optical Instruments'_

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