High-Q | 10 סימולציה

50

סימולציה מס' 01

פרק שלישי

– אנגלית

optical fibers can easily be inserted into the correct area (by, for example, using a syringe), and laser light directed at the affected part - perhaps an ulcer or a tumor. A third benefit is that the color of the laser can be finely adjusted so that only the 15 affected part absorbs the laser light. A dye laser (which uses a chemical dye in water or alcohol as the laser medium) can be made to operate at any wavelength in the visible spectrum so that a red birth mark or deep red 'port wine stain' can be selectively burned away, leaving healthy 'pink' skin nearby unharmed. Laser eye surgery has been particularly successful. An operation known as 'retinal 20 welding' is routinely performed for patients who suffer loss of clarity in their vision caused by detachment of their retinas. By shining laser light at the patient's eye, the lens in the eye focuses the laser beam onto the retina, and tacks the retina back in place with a spot-weld. 13. According to the first paragraph, lasers - (1) are currently used only in the inanimate world (2) might be dangerous when used in delicate operations (3) are especially helpful in operations in difficult places to reach (4) are limited in their uses 14. According to the second paragraph, laser operations on internal organs are made possible via the use of - (1) dye lasers (2) optical fibers (3) cutting and drilling (4) a scalpel Questions

15. A dye laser -

(1) is used to remove skin spots selectively (2) operates only at specific wavelengths

(3) might be dangerous (4) emits only red light

16. Focusing the laser on the retina is done by - (1) optical-fibers (2) a spot weld (3) the lens of the eye (4) dye

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