.
The light under goes 'Total Internal Reflection' and so travels along the fibre even around corners.
Light is totally relected by the internal surface of the glass fibre.
For more information see
Health Concerns
There is a health concern about the amount of energy absorbed by the brain when using mobile phones. Advice from the Stewart Report said that adults should limit the amounts of time spent on the phone, and for children the advice was much stronger. The Stewart Report recommends that under-16s use their phones only for essential calls. This is because children's skulls are thinner than adults and so their skull absorb less of the microwaves, leaving their brain less protected.
You phone will have a Specific Absorption Rates (SAR) rating. It is a reliable measure of its ability to cause cell damage and is a way of measuring the quantity of radiofrequency (RF) energy that is absorbed by the body. The LOWER the better. Look up yours on the manufactures websites:
Motorola;
Nokia;
Samsung;
Sony Ericsson.
