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प्रश्न
| 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. |
The magnification due to a compound microscope does not depend upon ______.
विकल्प
the aperture of the objective and the eye-piece
the focal length of the objective and the eye-piece
the length of the tube
the colour of the light used
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उत्तर
The magnification due to a compound microscope does not depend upon the aperture of the objective and the eye-piece.
Explanation:
Magnification when the image is formed at the near point of distinct vision is `"L"/"f"_"o"(1 + "D"/"f"_"e")`.
Magnification, when the image is formed at, is `"L"/"f"_"o" "D"/"f"_"e"`.
No expression contains the aperture terms. So, magnification does not depend on the aperture of the objective and the eye-piece.
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संबंधित प्रश्न
The total magnification produced by a compound microscope is 20. The magnification produced by the eye piece is 5. The microscope is focussed on a certain object. The distance between the objective and eyepiece is observed to be 14 cm. If least distance of distinct vision is 20 cm, calculate the focal length of the objective and the eye piece.
When viewing through a compound microscope, our eyes should be positioned not on the eyepiece but a short distance away from it for best viewing. Why? How much should be that short distance between the eye and eyepiece?
You are given the following three lenses. Which two lenses will you use as an eyepiece and as an objective to construct a compound microscope?
| Lenses | Power (D) | Aperture (cm) |
| L1 | 3 | 8 |
| L2 | 6 | 1 |
| L3 | 10 | 1 |
How can the resolving power of a compound microscope be increased? Use relevant formula to support your answer.
Draw a ray diagram showing image formation in a compound microscope ?
Suggest two ways by which the resolving power of a microscope can be increased?
Draw a ray diagram to show the working of a compound microscope. Deduce an expression for the total magnification when the final image is formed at the near point.
In a compound microscope, an object is placed at a distance of 1.5 cm from the objective of focal length 1.25 cm. If the eye piece has a focal length of 5 cm and the final image is formed at the near point, estimate the magnifying power of the microscope.
Define the magnifying power of a microscope in terms of visual angle.
In the case of a regular prism, in minimum deviation position, the angle made by the refracted ray (inside the prism) with the normal drawn to the refracting surface is ______.
On increasing the focal length of the objective, the magnifying power ______.
