An endoscope silica fibreefficiently contains all central lightrays that subtend an angle greaterthan 0, = 42.00° as measuredrelative to the normal of the sidesurface of a silica-based fibre(labelled as 0, in the followingdiagram). What is the refractiveindex of the fibre? Take the opticalfibre to be a solid cylinder residingin air.The following diagram shows acentral light ray. The ray passesthrough the axis of symmetry ofthe optical fibre.O1.351.491.461.530.741.47

It is mentioned that, for all angles greater than θ1 = 42.00 , silica fibre efficiently contains…

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