Ray OpticsResolving Power of Microscopes and Astronomical Telescopes (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 1  4 of 11
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Question number: 1
» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes
Question
A Galilean telescope consists of an objective of focal length 12 cm and eyepiece of focal length 4 cm. What should be the separation of the two lenses when the virtual image of a distant object is formed at a distance of 24 cm from the eyepiece?
Choices
Choice (4)  Response  

a.  8.2 cm. 

b.  12.4 cm. 

c.  7.2 cm 

d.  2.8cm. 

Question number: 2
» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes
Question
A vertical microscope is focused on a point at the bottom of an empty tank. Water (μ = 4/3) is then poured into the tank. The height of the water column is 4 cm. Another lighter liquid, which does not mix with water and which has refractive index 3/2 is then poured over the water. The height of liquid column is 2cm. What is the vertical distance through which the microscope must be moved to bring the object in focus again?
Choices
Choice (4)  Response  

a.  1.55 cm 

b.  2.61 cm 

c.  1.67 cm 

d.  3.12 cm 

Question number: 3
» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes
Assertion (Ꭺ)
By increasing the diameter of the objective of telescope, we can increase its range.
Reason (Ꭱ)
The range of a telescope tells us how far away a star of some standard brightness can be spotted by telescope.
Choices
Choice (4)  Response  

a.  Ꭺ is false but Ꭱ is true 

b.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

c.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

d.  Both Ꭺ and Ꭱ are false 

Question number: 4
» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes
Question
The light gathering power of a camera lens doesn’t depend on
(1) Ratio of focal length and diameter
(2) Product of focal length and diameter
(3) Wavelength of light used
(4) Its diameter
Select the correct answers and mark it according to the following codes:
Codes:
Choices
Choice (4)  Response  

a.  1 and 2 are correct 

b.  1, 2 and 3 are correct 

c.  2 and 4 are correc 

d.  1 and 3 are correct 
