Although he was a young man, Hynes was a member of a prominent Chicago political. family and his father, Tom Hynes, had been a State Senator, President of the Illinois. Senate and later Cook County Assessor, which is a powerful position.
Optical Fibres. Total internal reflection can occur as long as the angles made by the rays are greater than the critical angle. In glass the critical angle is around 42Â° and today we use very narrow fibres of glass to transmit pulses of light. These are called optical fibres.They are used in telecommunications to transmit telephone conversations and data-including this web page to your computer!n glass the critical angle is around 42Â° and today we use very narrow fibres of glass to transmit pulses of light. These are called optical fibres. They are used in telecommunications to transmit telephone conversations and data-including this web page to your computer!
An optical attenuator, or fiber optic attenuator, is a device used to reduce the power level of an optical signal, either in free space or in an optical fiber.The basic types of optical attenuators are fixed, step-wise variable, and continuously variable.ariable Optical Attenuator. An optical attenuator, or fiber optic attenuator, is a device used to reduce the power level of an optical signal, either in free space or in an optical fiber. The basic types of optical attenuators are fixed, step-wise variable, and continuously variable.