## Ray Optics And Optical Instruments Quiz-6

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.

Q51. A bi-convex lens is formed with two thin plano-convex lenses as shown in the figure. Refractive index n of the first lens is 1.5 and that of the second lens is 1.2. Both the curved surfaces are of the same radius of curvature R=14 cm. For this bi-convex lens, for an object distance of 40cm, the image distance will be
•  -280.0cm
•  40.0 cm
•  21.5 cm
•  13.3 cm
Solution

Q52.In a given direction, the intensities of the scattered light by a scattering substance for two beams of light are in the ratio of 256∶81. The ratio of the frequency of the first beam to the frequency of the second beam is
•  64∶127
•  4:3
•  64∶27
•  2:1
Solution

Q53.  Figure shows a cubical room ABCD with the wall CD as a plane mirror. Each side of the room is 3m. We place is camera at the midpoint of the wall AB. At what distance should the camera be focused to photograph an object placed at A
•  1.5 m
•  3 m
•  6 m
•  More than 6 m
Solution

Q54. In a compound microscope, the intermediate image is
•  Virtual erect and magnified
•  Real, erect and magnified
•  Real, inverted and magnified
•  Virtual, erect and reduced
Solution
Power of spectacles, P=2 D Since, power is positive so lens used is convex which is used for the purpose of removing hypermetropia.

Q55.In the visible region the dispersive powers and the mean angular deviations for crown and flint glass prisms are Ï‰,Ï‰' and d,d' respectively. The condition for getting deviation without dispersion when the two prisms are combined is
•  √Ï‰d+√(Ï‰'d')=0
•  Ï‰' d+Ï‰d'=0
•  Ï‰d+Ï‰' d'=0
•  (Ï‰d)2=(Ï‰' d' )2=0
Solution

Q56. The separation between two microscopic particles is measured PA and PB by two different lights of wavelength 2000 â„« and 3000 â„« respectively, then
•  PA>PB
•  PA<PB
• PA<3/2PB
•  A=PB
Solution
Resolving limit (minimum separation) ∝Î» ⇒PA/PB =2000/3000
⇒PA<PB

Q57.If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the medium is
•  3×108 m/s
•  1.5×108 m/s
•  6×108 m/s
•  √3×108 m/s
Solution
Î¼=1/sin⁡C =1/sin⁡30 =2 ∴v=(3×108)/2=1.5×108 m/s

Q58.Sun subtends an angle of 0.5° at the centre of curvature of a concave mirror of radius of curvature 15 m. The diameter of the image of the sum formed by the mirror is
•  8.55 cm
•  7.55 cm
•  6.55 cm
•  5.55 cm
Solution

Q59.The chromatic aberration in lenses becomes due to
•  Disimilarity of main axis of rays
•  Disimilarity of radii of curvature
•  Variation of focal length of lenses with wavelength
•  None of these
Solution
f∝1/(Î¼-1) and Î¼∝1/Î»

Q60. At the time of total solar eclipse, the spectrum of solar radiation would be
•  A large number of dark Fraunhoffer lines
•  A less number of dark Fraunhoffer lines
• No lines at all
•  All Fraunhoffer lines changed into brilliant colours
Solution
All Fraunhoffer lines changed into brilliant colours

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