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--- courses:phy100:3 [2023/06/22 11:40] – [4. eVscope and eQuinox] asad
+++ courses:phy100:3 [2023/06/22 11:41] (current) – [5. Seeing the invisible] asad
@@ Line 105: / Line 105: @@
 ===== - Seeing the invisible =====
-There are light waves beyond ultraviolet at the high-frequency end and beyond infrared at the low-frequency end. Heinrich Hertz detected such a wave for the first time and named 'x-ray' as it was unknown as of then. Later many more '**invisible**' light waves have been found. We use microwave light for heating our food and watching TV and we use radio waves for all kinds of wireless communication and the all-important Global Positioning System (GPS).
+There are light waves beyond ultraviolet at the high-frequency end and beyond infrared at the low-frequency end. Heinrich Hertz detected such a wave for the first time and named it 'x-ray' as it was unknown then. Later many more '**invisible**' light waves have been found. We use microwave light for heating our food and watching TV and we use radio waves for all kinds of wireless communication and the all-important Global Positioning System (GPS).
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