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प्रश्न
Explain the basic differences between the construction and working of a telescope and a microscope
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उत्तर
| Telescope | Microscope |
| It is used for observing distant images of heavenly bodies such as stars and planets. |
It is used for observing magnifying |
| The objective lens has a large focal length and large aperture |
The objective lens has a small focal length and short aperture. |
| The eye lens used has small focal length and small aperture. | The eye lens used has moderate focal length and large aperture. |
| The distance between the objective lens and eye lens is adjusted to focus the object situated at infinity. | The objective and eye lens are kept at a fixed distance apart, whereas the distance of the objective lens from the object is adjusted to focus an object. |
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संबंधित प्रश्न
Draw a labelled ray diagram showing the formation of a final image by a compound microscope at least distance of distinct vision
Define resolving power of a microscope and write one factor on which it depends
Draw a ray diagram showing the image formation by a compound microscope. Hence obtained expression for total magnification when the image is formed at infinity.
An object is to be seen through a simple microscope of focal length 12 cm. Where should the object be placed so as to produce maximum angular magnification? The least distance for clear vision is 25 cm.
Can the image formed by a simple microscope be projected on a screen without using any additional lens or mirror?
A simple microscope using a single lens often shows coloured image of a white source. Why?
A compound microscope consists of an objective of focal length 1 cm and an eyepiece of focal length 5 cm. An object is placed at a distance of 0.5 cm from the objective. What should be the separation between the lenses so that the microscope projects an inverted real image of the object on a screen 30 cm behind the eyepiece?
A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again?
An angular magnification of 30X is desired using an objective of focal length 1.25 cm and an eye piece of focal length 5 cm. How will you set up the compound microscope for the final image formed at least distance of distinct vision?
| A compound microscope consists of two converging lenses. One of them, of smaller aperture and smaller focal length, is called objective and the other of slightly larger aperture and slightly larger focal length is called eye-piece. Both lenses are fitted in a tube with an arrangement to vary the distance between them. A tiny object is placed in front of the objective at a distance slightly greater than its focal length. The objective produces the image of the object which acts as an object for the eye-piece. The eye-piece, in turn, produces the final magnified image. |
A compound microscope consists of an objective of 10X and an eye-piece of 20X. The magnification due to the microscope would be:
