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1. (25 pts) (i) When light goes from one medium into another medium with a higher index of refraction, A) its speed, wavelength, and frequency all decrease. B) its speed and wavelength decrease, but its frequency stays the same. C) its speed decreases but its wavelength and frequency both increases. D) its speed decreases but its frequency and wavelength stay the same. E) its speed increases, its wavelength decreases, and its frequency stays the same. (ii) An object is placed in front of a lens. Which of the following is true about the image? A) If the lens is convex, the image cannot be virtual. B) If the image is real, then it is also inverted. C) If the image is real, then it is also upright. D) If the image is virtual, then it is also inverted. E) If the image is virtual, the lens must be a diverging lens. (iii) In a double-slit experiment, if the slit separation is increased, which of the following is true about the interference pattern on the screen? A) The minima get closer together. B) The maxima stay at the same position. C) The minima and maxima stay at the same position. D) The minima stay at the same position. E) The maxima get further apart. (iv) A light beam shines through a thin slit and illuminates a distant screen. The central bright fringe on the screen is 1.00 cm wide, as measured between the dark fringes that border it on either side. Which of the following actions would decrease the width of the central bright fringe? (There may be more than one correct choice.) A) increase the wavelength of the light. B) decrease the wavelength of the light. C) increase the width of the slit. D) decrease the width of the slit. E) put the apparatus all under water. (v) The four panels below show four different situations when an incident ray (black arrow) composes of two colors (blue and red) refracts through an interface between two different materials. The approximate index of refraction for each material is indicated in the graph. Which panel(s) (A, B, C, and D) is (are) physically possible? A B с D X n=1.3 | n=1.5 n =1.5 In =1.3 n=1.3 In=1.5 n=1.5 | n=1.3
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