| 41. | The magnification is equal to the focal length of the objective lens divided by the focal length of the eyepiece.
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| 42. | It represents the distance at which the mirror or objective lens will cause light to converge on a single point.
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| 43. | Telescopic sights are classified in terms of the optical magnification and the objective lens diameter, e . g . 10?0.
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| 44. | The improvement in resolution is achieved by using two opposing objective lenses, which both are focused to the same geometrical location.
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| 45. | In the ideal case each objective lens can collect light from a solid angle of \ Omega = 2 \ pi.
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| 46. | So, with two objective lenses one can collect from every direction ( solid angle \ Omega = 4 \ pi ).
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| 47. | The image from the objective lens is focused on a narrow slit revealing only a thin portion of the suns surface.
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| 48. | The correct immersion oil for an objective lens has to be used to ensure that the refractive indices are correctly matched.
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| 49. | Objective lenses with higher magnifications normally have a higher numerical aperture and a shorter depth of field in the resulting image.
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| 50. | The laser light is divided by a beam splitter ( BS ) and directed by mirrors towards the two opposing objective lenses.
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