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Ray Optics and Optical Instruments Physics - Ray Optics and Optical Instruments

Gujarat Board (GSEB) - STD 12 Science - Physics (GSEB - English Medium). 117 questions in this chapter.

Question types

Ray Optics and Optical Instruments question types

117 questions across 5 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

117
Questions
5
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5
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Sample Questions

Ray Optics and Optical Instruments questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 63 Marks Question3 Marks
(a) When a telescope is turned upside down and looked at the objective, it appears very small, why?
(b) Why does this not happen in a microscope?
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Q 83 Marks Question3 Marks
A mobile phone is placed on the principal axis of a concave mirror. Show the formation of the image with a suitable ray diagram. Explain why the magnification is not uniform. Does the distortion of the image depend on the position of the phone relative to the mirror?
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Q 103 Marks Question3 Marks
Write the definition of wavefront. Using Huygens' principle, draw the shape of a plane wave incident on a convex lens and the refracted wave body.
###
(a) When a wave propagates from a rarer medium to a denser medium, then which characteristic of that wave does not change and why?
(b) The refractive indices of two mediums are $\mu_1$ and $\mu_2$, what will be the ratio of velocities in the wave in them?
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Q 121 Marks Question1 Mark
A convex lens with a refractive index is placed in that medium whose refractive index is equal to the refractive index of the lens. What will be the focal length of the lens in this medium?
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Q 16M.C.Q (1 Marks)1 Mark
If the magnification of optical instrument is negative, then the image will always be formed :
  • ✓
    Real and inverted
  • B
    Virtual and erect
  • C
    Real and erect
  • D
    Virtual and inverted

Answer: A.

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Q 17M.C.Q (1 Marks)1 Mark
If the magnification of objective and eyepiece in a compound microscope is ' $m_o$ ' and ' $m_e$ ' respectively, then the total magnifying power $( m )$ of the microscope will be :
  • A
    $m_o+m_e$
  • B
    $m_e-m_o$
  • ✓
    $m_o \cdot m_e$
  • D
    $\frac{m_o}{m_e}$

Answer: C.

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Q 19M.C.Q (1 Marks)1 Mark
If the refractive index of denser medium 1 relative to rare medium 2 is $n_{12}$ and the critical angle for the pair of these mediums is $i_{ c }$, then the relationship between $n _{12}$ and $i_c$ is :
  • A
    $n_{12}=\sin i_c$
  • B
    $n_{12}=\tan i_c$
  • C
    $n_{12}=\frac{1}{\tan i_c}$
  • ✓
    $n_{12}=\frac{1}{\sin i_c}$

Answer: D.

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Q 20M.C.Q (1 Marks)1 Mark
When half of a lens is wrapped in a black cloth, what will be the effect on the image formed by the lens?
  • A
    The image will disappear
  • B
    Will have no effect
  • C
    The image will become half its size
  • ✓
    The brightness of the image will decrease

Answer: D.

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Q 215 Marks Questions5 Marks
Define total internal reflection. Establish the relation between $u, v$ and $f$ for a spherical mirror. Draw the necessary ray diagram. ### Define lateral displacement. Derive the lens maker formula.
$
\frac{1}{f}=\left(n_{21}-1\right)\left(\frac{1}{R_1}-\frac{1}{R_2}\right)
$
Draw the necessary ray diagram. (Where the signs have their usual meanings.)
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Q 225 Marks Questions5 Marks
(a) What is meant by compound microscope? Draw a ray diagram of image formation by a compound microscope. Briefly describe its working and derive the formula for its total magnification.
(b) How does the resolving power of a microscope change when :
(i) The diameter of the objective lens decreases,
(ii) The wavelength of incident light increases?Justify your answer in each case.
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Q 235 Marks Questions5 Marks
Draw a labelled diagram of a refracting telescope. Obtain an expression for its magnifying power. Write two main disadvantages of refracting telescope as compared to reflecting telescope. ### What is meant by telescope? Draw the ray diagram of image formation by a refracting telescope. Briefly describe its working and derive the formula for its magnifying power.
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