Rubayat is standing in front of a glass statue in the shape of a square prism: the base is a square with a side length of a = 5 m, and the height is h = 3 m. No matter at what angle she looks at the prism, she can only see the reflection of the side walls but not through it (i.e. she cannot seee the wall opposite to her). The prism is placed in the air. What is the minimum possible refractive index?
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answer is 0.6 hope you understand
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