PH 2004 Spring Tests - Physics Honors Test: Chapters 23 and...

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Physics Honors Test: Chapters 23 and 24 Form 1 DO NOT WRITE ON THIS TEST. SHOW WORK ON ANSWER SHEET. REPORT ALL ANSWERS TO 3 SIGNIFICANT FIGURES VECTOR ANSWERS MUST HAVE MAGNITUDE AND DIRECTION USE SCIENTIFIC NOTATION WHEN APPROPRIATE {X >100 or X < 0.1} v f λ = c n v = 1 1 2 2 sin sin n n θ = c = 3.00 x 10 8 m/s 1 1 1 o i f d d = + i i o o h d h d = - sin d m = ( 29 ( 29 2 1 2 1 4 4 m m c t nf - - = = 2 2 m mc t nf = = A light wave travels from air into water, striking the boundary between the media at an angle = 40 ° to the normal, as shown at right. The speed of light in the air is c = 3.00 x 10 8 m/s, and the speed of light in water is v = 2.26 x 10 8 m/s. 1) In what direction does the refracted part of the light wave travel? ANSWER: [D29ºR] 2) If the light were traveling from the water toward the air, for what range of incident angles will no transmission occur? ANSWER: 90º ≥ ≥ 48.9º You place a ball of radius 3 cm at a point along the principal axis 15 cm from a converging mirror. The virtual reflection of the ball appears to have a radius of 7 cm. 3) What is the focal length of the mirror? ANSWER: 26.3 cm An object is placed a distance d in front of a diverging lens of focal length f . 4) Draw a ray diagram that will show the location, size, and orientation of the image produced by the lens. ANSWER: See Figure 23-33, p. 663 White light strikes a thin film of oil at the surface of a puddle of water. Part of the film appears to be green when viewed by an observer. The index of refraction of oil is 1.20, the index of refraction of water is 1.50, and green light has wavelength = 525 nm in air. 5) What are two possible values for the thickness of the green part of the film? ANSWER: 263 nm, 525 nm, 788 nm, etc. Red light of wavelength = 650 nm passes through a diffraction grating whose slits are 1000 nm apart, and then strikes a screen 4 cm away, as shown at right. 6) How wide is the central bright spot on the screen? ANSWER: 2.60 cm The visible color spectrum can be produced in various ways, from thin films to rainbows. 7) a) Explain how diffraction can create a spectrum. ANSWER: see p. 690 b) Explain how refraction can create a spectrum. ANSWER: see p. 686 c) Describe how the diffraction spectrum differs from the refraction spectrum. A converging lens, labeled #1, has a focal length 6 cm. A 2-cm tall candle is placed with its base a distance x from the center of lens, along the principal axis. An identical lens, labeled #2, is placed 23 cm behind the first lens, as shown. 8) You hold a vertical piece of paper between the lenses so that a sharp image of the candle is formed. If distance x = 13 cm, how far is the paper from lens #1? ANSWER:
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This note was uploaded on 08/29/2010 for the course PHYS 38234 taught by Professor Ramesh during the Spring '09 term at University of California, Berkeley.

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PH 2004 Spring Tests - Physics Honors Test: Chapters 23 and...

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