Wave Optics Quiz-4

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.

Q31. At what angle should an unpolarised beam be incident on a crystal ofÎ¼=√3, so that reflected beam is polarised?
•  40°
•  60°
•  90°
•
Solution
tan⁡ iP=Î¼=√3
∴iP=60°

Q32.In Young’s double slit experiment when wavelength used is 6000â„« and the screen is 40 cm from the slits, the fringes are 0.012 cm wide. What is the distance between the slits
•  0.024 cm
•  2.4 cm
•  0.24 cm
•  0.2 cm
Solution

Q33. Angular width of central maxima in the Fraunhoffter diffraction pattern of a slit is measured.The slit is illuminated by light of wavelength 6000 â„«.When the slit is illuminated by light of another wavelength,the angular width decreases by 30%.The wavelength of this light will be
•  6000 â„«
•  4200 â„«
•  3000 â„«
•  1800 â„«
Solution

Q34. An electromagnetic wave propagating along north has its electric field vector upwards. Its magnetic field vector point towards
•  North
•  East
•  West
•  Downwards
Solution
East

Q35.A glass slab of thickness 8 cm contains the same number of waves as 10 cm of water when both are transverse by the same monochromatic light. If the refractive index of water is 4/3, then refractive index of glass is
•  5/4
•  3/2
•  5/3
•  16/15
Solution

Q36. A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is
•  1.2 cm
• 1.2 mm
•  2.4 cm
•  2.4 mm
Solution

Q37. Two polaroids are placed in the path of unpolarized beam of intensity I0 such that no light is emitted from the second polaroid. If a third Polaroid whose polarization axis makes an angle Î¸ with the polarization axis of first Polaroid, is placed between these polaroids, then the intensity of light emerging from the last Polaroid will be
•  (I0/8) sin2⁡2Î¸
•  (I0/4) sin22Î¸
•  (I0/2) cos4⁡2Î¸
•  I0 cos40⁡
Solution
Let initial intensity of light is I0. So intensity of light after transmission from first Polaroid =I0/2. Intensity of light emitted from P3 I1=I0/2 cos2Î¸ Intensity of light transmitted from last Polaroid P2=I1 cos2 (90°-Î¸) P2=I0/2 cos2⁡Î¸ sin2⁡Î¸ P2=I0/8 (2 sin⁡Î¸ cos⁡Î¸ )2 P2=I0/8 sin22 Î¸

Q38.Two slits separated by a distance of 1 mm are illuminated with red light of wavelength 6.5×10-7 m. the interference fringes are observed on a screen place 1 m from the slits. The distance between the third dark fringe and the fifth bright fringe is equal to
•  0.65 mm
•  1.63 mm
•  3.25 mm
•  4.88 mm
Solution

Q39.Radiations of intensity 0.5 W/m2 are striking a metal plate. The pressure on the plate is
•  0.166×10-8 N/m2
•  0.332×10-8 N/m2
•  0.111×10-8 N/m2
•  0.083×10-8 N/m2
Solution

Q40. The principle of superposition is basic to the phenomenon of
•  Total internal reflection
•  Interference
•  Reflection
• Refraction
Solution
Interference

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