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Q. What is the minimum thickness for the air layer between two flat glass surfaces if the glass is to appear bright when 450-nm light is incident normally?

Q. It is said that Galileo discovered a basic principle of the pendulum - that the period is independent of the amplitude - by using his pulse to time the period of swinging lamps in the cathedral as they swayed in the breeze. Suppose that one oscillation of a swinging lamp takes 3.5 seconds. How long is the lamp chain?

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