Microscopes and Telescopes
Unless otherwise stated, the lens-to-retina distance is 2.00 cm.
Find the distance between the objective and eyepiece lenses in the telescope in the above problem needed to produce a final image very far from the observer, where vision is most relaxed. Note that a telescope is normally used to view very distant objects.
Review Questions Two notes form an octave. How are their frequencies related What are transverse and longitudinal (compressional) waves Give examples. Describe sound wave, compressions, rarefactions. How large are the pressure and density variations in sound waves Normal atmospheric pressure, due to weight of atmosphere, is 14.7 lb/in 2 Units: 1 m = 100 cm = 1000 mm = 3.28 ft, 1 kg weighs 2.21 lb. Explain wavelength , period P, frequency f=1/P and give their units. Speed, wavelength, and frequency related by v=f. As f increases, decreases. What is the audible range of wavelengths What is the audible range of frequencies Speed of sound in air is 344 m/s at 20 degrees Celsius (68 degrees Fahrenheit). How is the speed affected by changes in the temperature of the air Why do wind instruments change pitch as they warm up Simple harmonic motion. Sine (sinusoidal) curve. Resonance: The greatest vibration is produced when frequency of the driving force matches the natural vibrational frequency of system. Give examples. How does doubling the length of a wind instrument affect the wavelength, frequency, and pitch Describe and give examples of: 1. Regular and diffuse reflection. A wave is insensitive to obstacles and irregularities small in comparison with wavelength. Microscope can’t resolve object smaller than wavelength of light. 2. Refraction. Explain how nonuniform air temperature and wind lead to refraction of sound. 3. Diffraction. How does the spreading of a wave on passing through an opening depend on the wavelength and the size