The ratio of resolving powers of an optical microscope for two wavelengths =4000 and is:
1. 9:4
2. 3:2
3. 16:81
4. 8:27
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. |
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. |
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
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
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).
The graph between resolving power and accelerating potential V for an electron microscope is (P is resolving power):
1. | 2. | ||
3. | 4. |
Resolving power of a compound microscope:
1. Depends on the wavelength of light as \(\propto\)
2. Depends on the wavelength of light as \(\propto\) 2
3. Depends on the wavelength of light as \(\propto\)
4. Depends on the wavelength of light as \(\propto\)
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.
2.
3.
4.
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. |