Wave Optics Quiz-2

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q11. Electromagnetic waves can be deflected by
•  Electric field only
•  Magnetic field only
•  Both (a) and (b)
•  None of these
Solution
None of these

Q12.If c is the speed of electromagnetic waves in vacuum, its speed in a medium of dielectric constant K and relative permeability Î¼r is
•

•

•

•

Solution

Q13.  In Young’s double slit experiment a minima is observed when path difference between the interfering beam is
•  Î»
•  1.5Î»
•  2Î»
•  2.25Î»
Solution
1.5Î»

Q14. When the angle of incidence on a material is 60°, the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in ms-1)
•  3×108
•  (3/√2)×108
•  √3×108
•  0.5×108
Solution

Q15.A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first maxima of the diffraction pattern the phase difference between the rays coming from the edges of the slit is
•  0
•  Ï€/2
•  Ï€
•  2Ï€
Solution

Q16. Light waves can be polarized as they are
•  Transverse
•  Of high frequency
•  Longitudinal
•  Reflected
Solution
Only transverse waves can be polarized

Q17.A diffraction pattern is obtained using a beam of red light. What happens if the red light is replaced by blue light
•  No change
•  Diffraction bands become narrower and crowded together
•  Band become broader and farther apart
•  Bands disappear altogether
Solution
As Î»blue<Î»red and width of diffraction bands is directly proportional to Î», therefore diffraction bands become narrower and crowded

Q18.A Young’s double slit set up for interference is shifted from air to within water, then the fringe width
•  Becomes infinite
•  Decreases
•  Increases
•  Remain unchanged
Solution
When a Young’s double slit set up for interference is shifted from air to within water then the fringe width decreases.

Q19.Ordinary light incident on a glass slab at the polarising angle, suffers a deviation of22°. The value of the angle of refraction in glass in this case is
•  56°
•  68°
•  34°
•  22°
Solution
Deviation=ip-r=20° Also, ip=r=90° Solve to get r=34°

Q20. The waves of wavelength 5900 â„« emitted by any atom or molecule must have some finite total length which is known as coherence length. For sodium light, this length is 2.4 cm. The number of oscillations in this length will be
•  4.068×108
•  4.068×104
•  4.068×106
• 4.068×105
Solution

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