## Wave Optics Quiz-3

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.

Q21. The width of a single slit if the first minimum is observed at an angle 2° with a light of wavelength 6980â„«
•  0.2 mm
•  2×10-5 mm
•  2×105 mm
•  2 mm
Solution

Q22.In the context of Doppler effect in light, the term ‘red shift’ signifies
•  Decrease in frequency
•  Increase in frequency
•  Decrease in intensity
•  Increase in intensity
Solution
Decrease in frequency

Q23.  The condition for obtaining secondary maxima in the diffraction pattern due to single slit is
•  a sin⁡Î¸=nÎ»
•  a sin⁡Î¸=(2n-1) Î»/2
•  a sin⁡Î¸=(2n-1)Î»
•  a sin⁡Î¸=nÎ»/2
Solution
a sin⁡Î¸=(2n-1) Î»/2

Q24. n a single slit diffraction experiment first minimum for red light (660 nm) coincides with first maximum of some other wavelength Î»’. The value of Î»' is
•  4400 â„«
•  6600 â„«
•  2000 â„«
•  3500 â„«
Solution

Q25.Two nicol prism are first crossed and then one of them is rotated through60°. The percentage of incident light transmitted is
•  1.25
•  25.0
•  37.5
•  50
Solution

Q26. A narrow slit of width 2mm is illuminated by monochromatic light of wavelength 500nm. The distance between the first minima on either side on a screen at a distance of 1m is
•  5mm
•  0.5mm
• 1mm
• 10mm
Solution

Q27.In a two slit experiment with monochromatic light fringes are obtained on a screen placed at some distance from the slits.If the screen is moved by 5×10-2 m towards the slits, the change in fringe width is 3×10-5 m. If separation between the slits is 10-3 m, the wavelength of light used is
•  6000 â„«
•  5000 â„«
•  3000 â„«
•  4500 â„«
Solution

Q28.Light propagates 2cm distance in glass of refractive index 1.5 in time t0. In the same time t0, light propagates a distance of 2.25 cm in a medium. The refractive index of the medium is
•  4/3
•  3/2
•  8/3
•  None of these
Solution

Q29.If Young’s double slit experiment, is performed in water
•  The fringe width will decrease
•  The fringe width will increase
•  The fringe width will remain unchanged
•  There will be no fringe
Solution

Q30. Which of the following shows green house effect
•  Ultraviolet rays
•  Infrared rays
•  X-rays
• None of these
Solution
Infrared radiations reflected by low lying clouds and keeps the earth warm

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