Yeah, when using hide boxes, what text appears automatically and what text is hidden must be separated by the "|" symbol (you have to have something be automatically visible, so if you put ".|(your answer)" in the hide syntax you would get:)New to the forum... I hope I'm doing this "hide" thing right.
Answer: ~~When the angle of incidence is greater than the critical angle.~~
Edit: I'm not. Apologies.
When light moves from a vacuum to a certain piece of glass its velocity slows to 1.98 x 10^8 meters per second. What is the index of refraction of the piece of glass?
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