Chapter 36369P36.56Let I0represent the intensity of the light from the nebula and θ0its angular diameter. With thefirst telescope, the image diameter ′hon the film is given by oohf=−′as ′=−ho2000 mmbg.The light power captured by the telescope aperture is P1022004==LNMMOQPPIAIπmmaf, and the lightenergy focused on the film during the exposure is EtI1122004150LNMMOQPP∆mmminaf..Likewise, the light power captured by the aperture of the second telescope is20260 04LNMMOQPPI. mmafand the light energy is EIt2260 04=LNMMOQPP∆. Therefore, to havethe same light energy per unit area, it is necessary thatItIoo022202260 0490042004 1 5020004πθmmmmmmminmma f∆=.The required exposure time with the second telescope is∆t2222220090060 02 000338mmmmmmmmminminafaf..Additional ProblemsP36.57Only a diverging lens gives an upright diminished image. The image is virtual and
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .