The diameter of the human eye lens is 2 mm. What will be the minimum distance between two points to resolve them, which are situated at a distance of 50 meters from the eye? The wavelength of light is 5000 Å:
1. 2.32 m
2. 4.28 mm
3. 1.52 cm
4. 12.48 cm
Assume that light of wavelength 6000Å is coming from a star. What is the limit of resolution of a telescope whose objective has a diameter of 100 inches?
For what distance is ray optics a good approximation when the aperture is \(3\) mm wide and the wavelength is \(500\) nm?
1. \(32\) m
2. \(42\) m
3. \(18\) m
4. \(20\) m
A telescope has an objective lens of 10 cm diameter and is situated at a distance of one kilometre from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light is 5000 Å, is of the order of:
1. 5 m
2. 5 mm
3. 5 cm
4. 0.5 m
The angular resolution of a 10 cm diameter telescope for a wavelength of 5000 Å is of the order of:
1. 10–4 rad
2. 10–6 rad
3. 106 rad
4. 10–2 rad
Given below are two statements:
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 the wavelength of visible 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. |
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. |
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.
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 \(\propto\)
The graph between resolving power and accelerating potential V for an electron microscope is (P is resolving power):
1. | 2. | ||
3. | 4. |