## Ray Optics And Optical Instruments Quiz-5

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.

Q41. The least angle of deviation for a glass prism is equal to its refracting angle. The refractive index of glass is 1.5. Then the angle of prism is
•  2 cos-1(3/4)
•  sin-1⁡(3/4)
•  2 sin-1(3/2)
•  cot-1(3/2)
Solution

Q42.A diverging beam of light from a point source 5 having divergence angle Î±, falls symmetrically on a glass slab as shown. The angles of incidence of the two extreme rays are equal. If the thickness of the glass slab is t and the refractive index n, then the divergence angle of the emergent beam is
•  Zero
•  Î±
•  sin-1(1/n)
•  sin-1(1/n)
Solution
Since rays after passing through the glass slab just suffer lateral displacement hence we have angle between the emergent rays as Î±

Q43.  A medium shows relation between i and r as shown. If speed of light in the medium is nc then value of n is
•  1.5
•  2-1
•  2
•  3-1/2
Solution

Q44. What is the angle of incidence for an equilateral prism of refractive index √3 so that the ray is parallel to the base inside the prism?
•  30°
•  45°
•  60°
•  Either 30° or 60°
Solution

Q45.Image formed by a convex mirror is
•  Virtual
•  Real
•  Enlarged
•  Inverted
Solution
Image formed by convex mirror is virtual for real object placed anywhere

Q46. How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container (given that aÎ¼Ï‰=4/3)
•  8.0 cm
• 10.5 cm
•  12.0 cm
•  None of the above
Solution

Q47.What will be the colour of sky as seen from the earth, if there were no atmosphere
•  Line absorption spectrum
•  Band absorption spectrum
•  Line emission spectrum
•  Band emission spectrum
Solution
The atoms in the chromosphere absorb certain wavelengths of light coming from the photosphere. This gives rise to absorption lines

Q48.A transparent cube of 2.1 m edge contains a small air bubble. Its apparent distance when viewed through one face of the cube is 0.10 m and when viewed from the opposite face is 0.04 m. The actual distance of the bubble from the second face of the cube is
•  0.06 m
•  0.17 m
•  0.05 m
•  0.04 m
Solution

Q49.Emission spectrum of CO2 gas
•  Is a line spectrum
•  Is a band spectrum
•  Is a continuous spectrum
•  Does not fall in the visible region
Solution
Is a band spectrum

Q50. “Lux” is a unit of
•  Luminous intensity of a source
•  Illuminance on a surface
•  Transmission coefficient of a surface
• Luminous efficiency of source of light
Solution
Illuminance on a surface

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