Created by StemPy LabA telescope just resolves two stars in red light. The same telescope is then used with blue light, which has about half the wavelength. What can it do now?
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← An amateur astronomer has a refracting telescope with a lens 0.18 m across. She looks at a double star in light of wavelength 620 nm. What is the smallest angle between the two stars that her telescope can separate?A physics teacher makes a double slit from two cuts in metal foil. Each cut is 0.030 mm wide, and the centres of the cuts are 0.17 mm apart. A laser shines through them. The screen shows fine bright lines inside one broad central band. How many fine bright lines lie in that band? →
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