19 - fryer(vdf96 – Lens Optics – graves –(6 1 This...

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Unformatted text preview: fryer (vdf96) – Lens Optics – graves – (6) 1 This print-out should have 28 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points When you focus an optical instrument such as a camera or microscope, what are you actually doing to the lens? 1. One lens is moving while other lens is stationary. 2. None of these 3. Lens aperture changes. 4. Both lenses are moving with respect to each other. correct Explanation: The lenses are moving with respect to each other. 002 (part 2 of 2) 10.0 points What happens to the focal point of the image? 1. Changes correct 2. Remains the same Explanation: The focal point of the instrument is being changed. 003 10.0 points Suppose you look out the window and see your friend, who is standing 10.6 m away. To what focal length must your eye muscles adjust the lens of your eye so that you may see your friend clearly? Remember that the distance from the front to the back of your eye is about 1.90 cm. Correct answer: 1 . 8966 cm. Explanation: Basic Concept: 1 p + 1 q = 1 f Given: p = 10 . 6 m = 1060 cm q = 1 . 90 cm Solution: f = parenleftbigg 1 p + 1 q parenrightbigg − 1 = parenleftbigg 1 1060 cm + 1 1 . 9 cm parenrightbigg − 1 = 1 . 8966 cm 004 (part 1 of 5) 10.0 points The glass prism has an index of refraction that depends on the wavelength of the light that enters it. The index of refraction is 1 . 5 for light of wavelength 7 . 267 × 10 − 7 m in a vacuum and 1 . 65 for light of wavelength 4 . 103 × 10 − 7 m in vacuum. A beam of white light is incident from the left, perpendicular to the first surface, as shown in the figure, and is dispersed by the prism into its spectral components. 30 ◦ 90 ◦ 60 ◦ white light Vacuum Vacuum Glass Determine the speed of the 4 . 103 × 10 − 7 m light in the glass. Correct answer: 1 . 81692 × 10 8 m / s. Explanation: Let : c = 2 . 99792 × 10 8 m / s and n = 1 . 65 . n = c v , so v = c n = 2 . 99792 × 10 8 m / s 1 . 65 = 1 . 81692 × 10 8 m / s . fryer (vdf96) – Lens Optics – graves – (6) 2 005 (part 2 of 5) 10.0 points Determine the wavelength of the 7 . 267 × 10 − 7 m light in the glass. Correct answer: 4 . 84467 × 10 − 7 m. Explanation: Let : λ r = 7 . 267 × 10 − 7 m and n r = 1 . 5 . The wavelength is λ = v f = c n f = λ r n r = 7 . 267 × 10 − 7 m 1 . 5 = 4 . 84467 × 10 − 7 m . 006 (part 3 of 5) 10.0 points Determine the frequency of the 7 . 267 × 10 − 7 m light in the glass. Correct answer: 4 . 1254 × 10 14 Hz. Explanation: The frequency will not change, so f = c λ r = c λ b = 2 . 99792 × 10 8 m / s 4 . 103 × 10 − 7 m = 4 . 1254 × 10 14 s − 1 ....
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19 - fryer(vdf96 – Lens Optics – graves –(6 1 This...

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