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فیزیک دبیرستان - تعیین ضریب شکست جامدات بلوری گرانقیمت

تعیین ضریب شکست جامدات بلوری گرانقیمت

نویسنده :رضا دیبا
تاریخ:1388/06/4-12:52 بعد از ظهر

مشاهده:

وسایل لازم:
یک بشر 500cc ، یک بشر 50cc ، روغن مایع

شرح: مقداری روغن درون بشر بزرگ بریزید و بشر کوچک تر را به آرامی در آن بیندازید.

توضیح: ضریب شکست روغن مایعبا ضریب شکست شیشه برابر است. پس پرتوهای نور موقع عبور از مرز روغن- شیشه تغییری نمی کنند. به همین علت ما دیگر نمی توانیم شیشه را درون روغن تشخیص دهیم. در صنعت از این روش برای بدست آوردن ضریب شکست جامدات بلوری گران قیمت مانند یاقوت و الماس که شکل هندسی ساده ای ندارند استفاده می‌شود. یعنی بلور را در یک مایع می‌اندازد و با تغییر ضریب شکست مایع به روش تغییر غلظت یا گرم کردن و سرد گردن آن، کاری می‌کنند که بلور در مایع غیب شود (یعنی هم ضریب شکست شوند). سپس ضریب شکست مایع را اندازه می‌گیرند و به این ترتیب ضریب شکست بلور مورد نظر را پیدا می‌کنند.

منبع:مدرسه اینترنتی تبیان




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