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An optical microscope uses visible light...

An optical microscope uses visible light of wavelength ranging from ………….. To ………….

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The correct Answer is:
`4xx10^(-7)m` ; `8xx10^(-7)m`.
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For visible light the wavelength ranges from

Chlorophylls absorb visible light of wavelengths

The limit of resolution of a microscope is the least distance between two point objects which can be seen clearly and distinctively with it. For a naked eye, limit of resolution is about 10^(-4) m or 0.1 mm. The limit of resolution for a microscope is of the order of lambda/2 , where lambda is wavelength of light used. For an optical microscope , using visible light, limit of resolution is "500 nm"/2 =250 mm. This is 400 times smaller than naked eye. So the useful magnification produced by it is 400. Smaller is the limit of resolution, greater is the magnification that can be achieved. By using shorter wavelengths , we can improve resolution. For examination of a microorganism, much higher limit of resolution is needed, the Wave nature of electron provides a means for probes of very small size organisms. An electron beam accelerated by a high potential difference possess a very short wavelength. In an electron microscope magnetic lenses are used to control the path of electrons. The image of object is obtained on a fluorescent screen or on a photographic plate. The electron microscope with its high magnifying power and resolving power , is one of the most indispensable and powerful tool for research in science , medicine and industry. The advantage of electron microscope over optical microscope is that

The resolving power of electron microscope is higher that that of an optical microscope because the wavelength of electrons is ……. Than the wavelength of visible light.

The wavelength of visible light is

Wavelength of visible light/PAR is

Given below are two statements : one is labelled as Assertion A and the other is labelled as Assertion A: An electron microscope can achieve better resolving power than an optical microscope. Reason R : The de Broglie's wavelength of the electrons emitted from an electron gun is much less than wavelength of visible light. In the light of the above statements, choose the correct answer from the options given below:

Two points separated by a distance of 0.1mm can just be resolved in a microscope when a light of wavelength 6000Å is used. If the light of wavelength 4800Å is used this limit of resolution becomes

Two points separated by a distance of 0.1 mm can just be resolved in a microscope when a light of wavelength 6000 Å is used. If the light of wavelength 4800 Å is used this limit of resolution becomes :-

PRADEEP-PHYSICAL WORLD AND MEASUREMENT-Fill in the blanks
  1. …………… is used for measurig long time intervals of the order of ……….. S...

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  2. Any phenomenon that…………. Can serve as a …………… .

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  3. An optical microscope uses visible light of wavelength ranging from ……...

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  4. Universal gravitational constant, universal gas constant and …….. Are ...

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  5. Methematical constants, pi, etc. are called ……….. .

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  6. Angle, …………. And ……. Are some of the ……….. Variables.

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  7. Some of the dimensional veriables are …………. , ……………. , …………… .

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  8. Which of the following physical quantities has a unit but no dimension...

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  9. The dimensional formula of Hubble constant. Is same as that of frequen...

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  10. Can there be a physical quantity, which has no units and no dimensions...

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  11. The dimension of length in pressure gradient is ……… .

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  12. The dimension formula of Stefan's constant is………… .

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  13. [M^1 L^2 T^(-3) A^(-2)] is the ………… formula of …………. .

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  14. The …….. In the ………….. Value and …………. Value of a quantity is called …...

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  15. The …………. Of systematic error are………….. . Therefore, such errors can b...

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  16. The ……….. Value that can be measured by a ………….. Is called …………. Of th...

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  17. The ……….. Error are those which occur ……… by …………. .

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  18. ………….. Errors arise on account of shear……………… of the ………….. .

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  19. …………. Error or ……………. Error is the ratio of …………….. To …………… of the qu...

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  20. Maximum ………… error in sum of difference of two quantites is ………… of ab...

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