Detailed Instructions: In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.
Q: Question: When the electromagnetic radiation passes from the air to a medium like glass its wavelength:
Options: <0> It remains unchanged. <1> Increase approximately 10 nm. <2> Increase approximately 100 nm. <3> It decreases approximately 1 nm. <4> It decreases approximately 200 nm.
A:
chemistry