如图所示,一储油圆桶,底面直径与桶高均为[tex=0.857x1.0]MmCGTKVEQ0lXKgo904MgDQ==[/tex]当桶内无油时,从某点[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]恰能看到桶底边缘上的某点[tex=1.071x1.0]lzlbosGwxwganNnEjSe9UQ==[/tex]当桶内油的深度等于桶高一半时,在[tex=0.786x1.0]Yn3GgEZev6SOu2r4v1WnCw==[/tex]点沿[tex=1.571x1.0]JLMbVw4e37VvhkU494+8Ew==[/tex]方向看去,看到桶底上的[tex=0.714x1.0]J/aA9EEo0KmJFnWWfX7LmQ==[/tex]点, [tex=2.571x1.286]JYxLfh6WrvwRghLFJIa2Zw==[/tex] 相距 [tex=0.786x2.429]mODYNyiL4C1sRgw5UVH00w==[/tex]. 由此可得油的折射率以及光在油中传播的速度为[img=215x222]17e52651d91ca56.png[/img] 未知类型：{'options': ['[tex=10.786x2.643]MGvFLG/cFmQBpt4kLFYFszELIurgtM51J7tdSh4GhYd27hqj8Vy0Y6J8MzHExwBdM8CXwEBZ/+D5nrp0lIhh87Af+vfZQ36lBa8y3La4ots=[/tex]', '[tex=10.786x2.643]VMzgRsJdxt/4l97g4g2SRa37UH/MYj98UjhpCdc6VITWCH6djJ+TwUduzQBDnricnjDO0Vace2cM+LG28ALRNEiU5/DhpPDPCr4hBBeKc/0=[/tex]', '[tex=11.571x2.643]VMzgRsJdxt/4l97g4g2SRaI/32B8Nqp6btVMGFgNZV+ukkap8QFEpOturxYOdvO2Nhfec3qyJ5qoRkTGa7jQ1dE76Z5EvrXvQY0b5yqVl3o=[/tex]', '[tex=11.5x2.643]MGvFLG/cFmQBpt4kLFYFs1zoolXHocJ71jlW8+Z0ORrJEkaptUpYBudPCOQ7+T8nFVUZ0p6AwYx+f4YjW404769+DK9PE/sCbfQDXk+fWyk=[/tex]'], 'type': 102}

如图所示,一储油圆桶,底面直径与桶高均为 [tex=0.571x1.0]hXwI6nnMJ2kxGYNl2OSrPw==[/tex]. 当桶内无油时,从某点 [tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex] 恰能看到桶底边缘上的某点[tex=0.786x1.0]9uq8NvjklzVl/yrUHrVKTg==[/tex]. 当桶内油的深度等于桶高一半时,在 [tex=0.786x1.0]b4HkKtHXeHofHX/gJc8Agg==[/tex] 点沿 [tex=1.571x1.0]mCjAngcIqtveplNftuY0BQ==[/tex] 方向看去,看到桶底上的 [tex=0.714x1.0]YiLkHgl7MlxE+QjUplQUKA==[/tex] 点, [tex=2.571x1.286]JYxLfh6WrvwRghLFJIa2Zw==[/tex] 相距[tex=0.786x2.429]kAcXn7gNlgRh3l7CRLe9UA==[/tex]. 由此可得油的折射率以及光在油中传播的速度为[img=239x271]17a5c49a596b000.jpg[/img] 未知类型：{'options': ['[tex=2.0x2.643]MGvFLG/cFmQBpt4kLFYFs3W32qybliR61sYba9lITcI=[/tex], [tex=7.143x1.429]T1+ET5DDIBdigRf6WNiWwUVEUaeZ4g0omZgFvzQaaQ+o+tOuGE6JcGg7XMJmOiW6[/tex]', '[tex=2.0x2.643]VMzgRsJdxt/4l97g4g2SRUlt6pgEjnWhWyzxsdgblCE=[/tex],\xa0[tex=7.143x1.429]T1+ET5DDIBdigRf6WNiWwUVEUaeZ4g0omZgFvzQaaQ+o+tOuGE6JcGg7XMJmOiW6[/tex]', '[tex=2.0x2.643]VMzgRsJdxt/4l97g4g2SRUlt6pgEjnWhWyzxsdgblCE=[/tex], [tex=7.929x1.429]WVEgpLI1qltekghCB0P8FcGyFeoNFoH7/1k5zpKfnX7L5v68PvY7R2/K+Gf/FVuW[/tex]', '[tex=2.143x2.643]MGvFLG/cFmQBpt4kLFYFs3W32qybliR61sYba9lITcI=[/tex], [tex=7.929x1.429]WVEgpLI1qltekghCB0P8FcGyFeoNFoH7/1k5zpKfnX7L5v68PvY7R2/K+Gf/FVuW[/tex]'], 'type': 102}