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কোনো মাধ্যমে আলোর বেগ অপর মাধ্যমের চেয়ে বেশি হলে, প্রথম মাধ্যমকে দ্বিতীয় মাধ্যমের তুলনায় লঘুতর মাধ্যম এবং দ্বিতীয় মাধ্যমকে প্রথম মাধ্যমের তুলনায় ঘনতর মাধ্যম বলে।
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কোনো মাধ্যমে আলোর বেগ অপর মাধ্যমের চেয়ে বেশি হলে, প্রথম মাধ্যমকে দ্বিতীয় মাধ্যমের তুলনায় লঘুতর মাধ্যম এবং দ্বিতীয় মাধ্যমকে প্রথম মাধ্যমের তুলনায় ঘনতর মাধ্যম বলে।