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Ray Optics And Optical Instruments Quiz-10

Dear Readers,

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. 



Q91. In compound microscope, magnifying power is 95 and the distance of object from objective lens is 1/3.8 cm. The focal length of objective lens is 1/4 cm. What is the magnification of eye piece?
  •  5
  •  10
  •  100
  •  200
Solution
                        

Q92.Given a point source of light, which of the following can produce a parallel beam of light
  •  Convex mirror
  •  Concave mirror
  •  Concave lens
  •  Two plane mirrors inclined at an angle of 90°
Solution
Object should be placed on focus of concave mirror

Q93.  The refractive index of water is 1.33. The direction in which a man under water should look to see the setting sun is
  •  49° to the horizontal
  •  90° with the vertical
  •  49° to the vertical
  •  Along the horizontal
Solution
Ray from setting sun will be refracted at angle equal to critical angle

Q94. At Kavalur in India, the astronomers using a telescope whose objective had a diameter of one metre started using telescope of diameter 2.54 m. This resulted in
  •  The increase in the resolving power by 2.54 times for the sameλ
  •  The increase in the limiting angle by 2.54 times for the sameλ
  •  Decrease in the resolving power
  •  No effect on the limiting angle
Solution
The increase in the resolving power by 2.54 times for the sameλ

Q95. A compound microscope has two lenses. The magnifying power of one is 5 and the combined magnifying power is 100. The magnifying power of the other lens is
  •  10
  •  20
  •  50
  •  25
Solution
  (b) m=mo×me⇒100=5×me⇒me=20

Q96 Consider an equiconvex lens of radius of curvature R and focal length f. If f>R, the refractive index μ of the material of the lens
  •  Is greater than zero but less than 1.5
  • Is greater than 1.5 but less than 2.0
  •  Is greater than one but less than 1.5
  •  None of the above
Solution
                           



Q97.A compound microscope has an eyepiece of focal length 10 cm and an objective of focal length 4 cm. Calculate the magnification, if an object is kept at a distance of 5 cm from the objective, so that final image is formed at the least distance of distinct vision 20 cm.
  •  12
  •  11
  •  10
  •  13
Solution
                             

 


Q98.For total internal reflection to take place, the angle of incidence i and the refractive index μ of the medium must satisfy the inequality
  •  1/sin⁡i <μ
  •  1/sin⁡i >μ
  •  sin⁡i<μ
  •  sin⁡i>μ
Solution
For total internal reflection i>C ⇒sin⁡C>sin⁡C⇒sin⁡i>1/μ⇒1/sin⁡i <μ

Q99.Two thin lenses of focal length 20 cm and 25 cm are in contact. The effective power of the combination is
  •  4.5 D
  •  18 D
  •  25 D
  •   9 D
Solution
                       

Q100. A vessel of height 2d is half-filled with a liquid of refractive index √2 and the other half with a liquid of refractive index n (the given liquids are immiscible). Then the apparent depth of the inner surface of the bottom of the vessel (neglecting the thickness of the bottom of the vessel) will be
  •  n/d(n+√2)
  •  d(n+√2)/(n√2)
  •  (√2 n)/d(n+√2)
  • nd/((d+√2n) )
Solution
                                          



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