Transmission by optical fibres is an important method in communications. By total internal reflection. Light is made to travel only along the core. However, the intensity falls-off exponentially with distance and is given by, I = I_(0)^(e-alphax), where alpha is absorption coefficient. Then the correct graph for intensity vs distance is

Transmission by optical fibres is an important method in communication

1.	Transmission by optical fibres is an important method in communications. By total internal reflection. Light is made to travel only along the core. However, the intensity falls-off exponentially with distance and is given by, I = I_(0)^(e-alphax), where alpha is absorption coefficient. Then the correct graph for intensity vs distance is
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