Question types

Wave Optics question types

397 questions across 1 question group — pick any mix to generate a Physics paper with step-by-step answer keys.

397
Questions
1
Question groups
5
Question types
Sample Questions

Wave Optics questions

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

The angle of polarisation for any medium is $60^{\circ}$, what will be critical angle for this
  • A
    $\sin ^{-1} \sqrt{3}$
  • B
    $\tan ^{-1} \sqrt{3}$
  • C
    $\cos ^{-1} \sqrt{3}$
  • $\sin ^{-1} \frac{1}{\sqrt{3}}$

Answer: D.

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Three observers $A, B$ and $C$ measure the speed of light coming from a source to be $v_A, v_B$ and $v_C$. The observer $A$ moves towards the source, the observer $C$ moves away from the source with the same speed. The observer $B$ stays stationary. the surrounding space is vacuum every where. Then
  • A
    $\mathrm{v}_{\mathrm{A}}>\mathrm{v}_{\mathrm{B}}>\mathrm{v}_{\mathrm{C}}$
  • B
    $\ce{v_A < v_B < v_C}$
  • $\mathrm{v}_{\mathrm{A}}=\mathrm{v}_{\mathrm{B}}=\mathrm{v}_{\mathrm{C}}$
  • D
    $\mathrm{v}_{\mathrm{A}}=\mathrm{v}_{\mathrm{B}}>\mathrm{v}_{\mathrm{C}}$

Answer: C.

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A slit of width a is illuminated by white light. For red light $(\lambda = 6500 \mathring A ),$ the first minima is obtained at $\theta = 30^\circ .$ Then the value of a will be
  • A
    $3250 \mathring A$
  • B
    $6.5 \times 10^{-4} \mathrm{~mm}$
  • $1.24$ microns
  • D
    $2.6^{\times 10^{-4}} \mathrm{~cm}$

Answer: C.

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A radio receiver antenna that is $2 m$ long is oriented along the direction of the electromagnetic wave and receives a signal of intensity $5 \times 10^{-16} W/m^2$. The maximum instantaneous potential difference across the two ends of the antenna is
  • $1.23\ mV$
  • B
    $1.23\ mV$
  • C
    $1.23\ V $
  • D
    $12.3\ mV$

Answer: A.

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Direction of the first secondary maximum in the Fraunhofer diffraction pattern at a single slit is given by $($a is the width of the slit$)$
  • A
    $\operatorname{a sin} \theta=\frac{\lambda}{2}$
  • B
    $a \cos \theta=\frac{3 \lambda}{2}$
  • C
    $\operatorname{a sin} \theta=\lambda$
  • $\operatorname{a sin} \theta=\frac{3 \lambda}{2}$

Answer: D.

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