## Ray Optics And Optical Instruments Quiz-8

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.

Q71. A concave mirror of focal length 100cm is used to obtain the image of the sun which subtends an angle of 30'. The diameter of the image of the sun will be
•  1.74cm
•  0.87cm
•  0.435cm
•  100cm
Solution

Q72.In refraction, light waves are bent on passing from one medium to the second medium, because, in the second medium
•  The frequency is different
•  The coefficient of elasticity is different
•  The speed is different
•  The amplitude is smaller
Solution
Refractive index of refracted medium w.r.t. incident medium =(Speed in incident medium)/(Speed in refracted medium)

Q73.  When a glass lens with n=1.47 is immersed in a trough of liquid, it looks to be disappeared. The liquid in the trough could be
•  Water
•  Kerosene
•  Glycerin
•  Alcohol
Solution
Glass lens will disappear if Î¼L=Î¼g. Therefore, when a glass lens of refractive index 1.47 is immersed in glycerin whose refractive index is 1.473 (at 20℃), the glass lens look like disappeared

Q74. A beaker containing a liquid appears to be half when it is actually two third full.The refractive index of liquid
•  7/6
•  6/5
•  3/2
•  4/3
Solution

Q75.Which of the following diagrams shows correctly the dispersion of white light by a prism
•

•

•

•

Solution
Because in dispersion of white light, the rays of different colours are not parallel to each other. Also deviation takes place in same direction

Q76 Two lenses are placed in contact with each other and the focal length of combination is 80 cm. If the focal length of one is 20 cm, then the power of the other will be
•  1.66 D
• 4.00 D
•  -1.00 D
•  -3.75 D
Solution

Q77.A 16 cm long image of an object is formed by a convex lens on a screen. On moving the lens towards the screen, without changing the positions of the object and the screen, a 9 cm long image is formed again on the screen. The size of the object is
•  9 cm
•  11 cm
•  12 cm
•  13 cm
Solution

Q78.The dispersion for a medium of wavelength Î» is D, then the dispersion for the wavelength 2Î» will be
•  D/8
•  D/4
•  D/2
•  D
Solution

Q79.The resolving power of a telescope depends on
•  Focal length of eye lens
•  Focal length of objective lens
•  Length of the telescope
•   Resolving power of telescope =d/(1.22 Î»)
Solution
Resolving power of telescope =d/(1.22 Î»)

Q80. A point object is placed at distance of 20 cm from a thin planoconvex lens of focal length 15 cm. The plane surface of the lens is now silvered. The image created by the system is at

•  60 cm to the left of the system
•  60 cm to the right of the system
•  12 cm to the left of the system
• 12 cm to the right of the system
Solution

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