## Wave Optics Quiz-7

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.

Q61. In Young’s experiment, one slit is covered with a blue filter and the other (slit) with a yellow filter. Then the interference pattern
•  Will be blue
•  Will be yellow
•  Will be green
•  Will not be formed
Solution
For interference, Î» of both the waves must be same

Q62.A slit of width a is illuminated by red light of wavelength 6500â„«. If the first minimum falls at Î¸=30°, the value of a is
•  6.5×10-4 mm
•  1.3 micron
•  3250â„«
•  2.6×10-4 cm
Solution
According to principle of diffraction a sin⁡Î¸=nÎ» Where n = order of secondary minimum ∴a sin⁡30°=1×(6500×10-10 Or a=1.3×10-6 m Or a=1.3 micron

Q63.  In Young’s double slit experiment the wavelength of light was changed from 7000â„« to 3500â„«. While doubling the separation between the slits which of the following is not true for this experiment
•   The width of the fringes changes
•  The colour of bright fringes changes
•  The separation between successive bright fringes changes
•  The separation between successive dark fringes remains unchanged
Solution
Î²∝Î»/d

Q64. Which of the following is not electromagnetic in nature
•  X-rays
•  Gamma rays
•  Cathode rays
•  Infrared raysd
Solution
Cathode rays

Q65.Interference may be seen using two independent
•  Sodium lamps
•  Fluorescet tubes
•  Lasers
•  Mercury vapour lamps
Solution
Interference may be seen using two independent lasers.

Q66. A mixture of light, consisting of wavelength 590 nm and an unknown wavelength, illuminates Young’s double slit and gives rise to two overlapping interference patterns on the screen.The central maximum of both lights coincide.Further, it is observed that the third bright fringe of known light coincides with the 4th bright fringe of the unknown light. From this data, the wavelength of the unknown light is
•  393.4 nm
• 885.0 nm
•  442.5 nm
•  776.8 nm
Solution

Q67.If white light is used in the Newton’s rings experiment, the colour observed in the reflected light is complementary to that observed in the transmitted light through the same point. This is due to
•  90° change of phase in one of the reflected waves
•  180° change of phase in one of the reflected waves
•  145° change of phase in one of the reflected waves
•  45° change of phase in one of the reflected waves
Solution
90° change of phase in one of the reflected waves

Q68.Energy stored in electromagnetic oscillations is in the form of
•  Electrical energy
•  Magnetic energy
•  Both (a) and (b)
•  None of these
Solution
Both (a) and (b)

Q69.In the visible region of the spectrum the rotation of the plane of polarization is given by Î¸=a+b/Î»2 . The optical rotation produced by a particular material is found to be 30° per mm at Î»=5000â„« and 50°per mm at Î»=4000â„«. The value of constant a will be
•  +(50°)/9 per mm
•  -(50°)/9 per mm
•  +(9°)/50 per mm
•  -(9°)/50 per mm
Solution

Q70. Evidence for the wave nature of light cannot be obtained from
•  Reflection
•  Doppler effect
•  Interference
• Diffraction
Solution
Reflection phenomenon is shown by both particle and wave nature of light

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