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An arrangement of plane mirrors and a spherical glass surface is shown in figure. O is the centre of the spherical portion. The incident light ray from air makes an angle of 60∘ with the normal and the normal makes an angle of 60∘ with each plane mirrors. The value of refractive index for which a light ray retraces its path will be |
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Answer» An arrangement of plane mirrors and a spherical glass surface is shown in figure. O is the centre of the spherical portion. The incident light ray from air makes an angle of 60∘ with the normal and the normal makes an angle of 60∘ with each plane mirrors. The value of refractive index for which a light ray retraces its path will be |
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