中三 Physics - Refraction

anthony

麻煩大家幫幫忙，教導我如何完成這道題目。請寫上步驟。

A ray of light passes into and out of a glass block as shown. What is the minimum
refractive index of the glass?

                               
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(原載於 "Physics in Life")

抹茶可樂

angle of incidence=45°
minimum refractive index=1/sin45°=1.41 (corr. to 3 sig. fig.)