The ratio of resolving powers of an optical microscope for two wavelengths ${\lambda }_{1}$=4000 $\stackrel{0}{A}$ and ${\lambda }_{2}=6000$ $\stackrel{0}{A}$ is:

1. 9:4

2. 3:2

3. 16:81

4. 8:27

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
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NEET - 2017
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Given below are two statements:

 Assertion (A): The resolving power of a telescope is more if the diameter of the objective lens is more. Reason (R): An objective lens of large diameter collects more light.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
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A major breakthrough in the studies of cells came with the development of an electron microscope. This is because:

 1 the resolution power of the electron microscope is much higher than that of the light microscope. 2 the resolving power of the electron microscope is 200-350 nm compared to 0.1-0.2 nm for the light microscope. 3 electron beam can pass through thick materials, whereas light microscopy requires thin sections. 4 the electron microscope is more powerful than the light microscope as it uses a beam of electrons that has a wavelength much longer than that of photons.

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
55%
From NCERT
AIPMT - 2006
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The distance of the moon from the earth is . The eye is most sensitive to light of wavelength 5500 Å. The minimum separation between two points on the moon that can be resolved by a 500 cm telescope will be:

1. 51 m

2. 60 m

3. 70 m

4. All the above

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
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The ratio of resolving powers of an optical microscope for two wavelengths  is:

1. 8:27

2. 9:4

3. 3:2

4. 16:81

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
91%
From NCERT
NEET - 2017
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The resolving power of a microscope can be increased by using:

1.  red light.
2.  blue light.
3.  oil between objective lens and object.
4.  both (2) and (3).

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
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The graph between resolving power and accelerating potential V for an electron microscope is (P is resolving power):

 1 2 3 4
Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
51%
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Resolving power of a compound microscope:

1.  Depends on the wavelength of light as $$\propto$$ $\lambda$

2.  Depends on the wavelength of light as $$\propto$$ $\lambda$2

3.  Depends on the wavelength of light as $$\propto$$ $\frac{1}{\lambda }$

4.  Depends on the wavelength of light as $$\propto$$ $\frac{1}{{\lambda }^{2}}$

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
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Assume that light of wavelength 600 nm is coming from a star. The limit of resolution of telescope whose objective has a diameter of 2 m is:

1. $1.83×{10}^{-7}$ $rad$

2. $7.32×{10}^{-7}$ $rad$

3. $6.00×{10}^{-7}$ $rad$

4. $3.66×{10}^{-7}$ $rad$

Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
69%
From NCERT
NEET - 2020
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The resolving power of a compound microscope will be maximum when:

 1 red light is used to illuminate the object. 2 violet light is used to illuminate the object instead of red light. 3 infrared light is used to illuminate the object instead of visible light. 4 the microscope is in normal adjustment.
Subtopic:  Resolving Power of Optical Devices (OLD NCERT) |
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