1.

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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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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