When light passes from vacuum (index of refraction n = 1) into water (n = 1.333),A. the wavelength increases and the frequency is unchangedB. the wavelength decreases and the frequency is unchangedC. the wavelength is unchanged and the frequency increasesD. the wavelength is unchanged and the frequency decreasesE. both the wavelength and the frequency change33.1IIIIII253525o40oooA ray of light passes through 3 regions labeled I, II, and III, as shown. How do the indices of refraction of regions I and III compare?A) nI> nIIB) nI< nIIIC) nI= nIIID) Impossible to tell35-2glass air A light ray inside glass is totally internally reflected from an air-glass interface as shown.The air surrounding the glass is replaced with water. With the same light ray in the glass, the total internal reflection will now...A) definitely not occur.B) definitely occur.C) not enough information to know35-4Light passes from a medium of index of refraction nainto a second medium of index of refraction nb. In order for total internal reflection to occur, it must be true thatA. na> nband the incident angle qais greater than the critical angleB. na> nband the incident angle qais less than the critical angleC. na< nband the incident angle qais greater than the critical angleD. na< nband the incident angle qais less than the critical angle33-3Pink Green Yellow air, n =1 glass, n =1.5 A ray of light passes thru a sheet of glass which is thick at the bottom and thin at the top. Which way is the ray traveling after it has passed through the glass? A) bent toward the thin endB) UndeviatedC) bent toward the thick end35-3ABCD) n3> n2> n1E) n1= n2= n3A light wave travels through three transparent materials of equal thickness. Rank is order, from the largest to smallest, the indices of refraction n1, n2, and n3.A. n2> n1> n3B. n3> n1> n2C. n1> n2> n3Optics 1A fish swims below the surface of the water at P. An observer at O sees the fish atA) a greater depth than it really is.B) the same depth.C) a smaller depth than it really is.Optics 4A converging lens focuses the light from a nearby point source onto an image, as shown. The "focal point" of a lens is the point on the optic axis, one focal length f from the lens. Where is the focal point of this lens?image object Pink Yellow Green A B C36-4A converging lens has a focal length f = 20cm when it is in air. The lens is made of glass with index of refraction nglass= 1.6. When the lens is placed in water (nwater= 1.33), the focal length of the lens is..A) Unchanged. B) greater, f > 20 cm.C) smaller, f < 20cm36-1A lens produces a sharply-focused, inverted image on a screen. What will you see on the screen if the lens is removed?A. The image will be as it was, but much dimmer.B. The image will be right-side-up and sharp.C. The image will be right-side-up and blurry.D. The image will be inverted and blurry.E. There will be no image at all.Optics 2Two point sources of light are imaged onto a screen by a converging lens as shown. The images are labeled 1 and 2. A mask is used to cover up the left half of the lens, as shown. What happens to the images on the screen when the mask is inserted over the left half the lens?screenlensmask12A) Image 1 vanishesB) Image 2 vanishesC) Something else happens36-2Which of these actions will move the image point P´ further from the boundary? A. Increase the radius of curvature R.B. Increase the index of refraction n.C. Increase the object distance s.D. Decrease the radius of curvature R.Optics 3ffobjectThe image formed by the lens is A) Real, non-invertedB) Real, invertedC) Virtual, non-invertedD) Virtual , invertedE) no image is formedOptics 4imageobject(virtual!)dodiAn object is placed closer to a magnifying glass than the focal length. What are the signs of the focal length f, the object distance do, and the image distance di?A) f > 0, do> 0, di< 0. B) f < 0, do> 0, di< 0.C) f > 0, do< 0, di> 0. D) f > 0, do> 0, di> 0.36-6An object is placed is placed near a diverging lens, but the object is closer to the lens than the absolute value of the focal length of the lens. The magnitude of the image distance, compared to the object distance, is ...A) Smaller (di<do)B) Larger (di>do)C) Same (di=do)36-5bAn object is placed is placed near a diverging lens, but the object is closer to the lens than the absolute value of the focal length of the lens. The image formed is..A) RealB) VirtualC) there is no image.36-5A person who is "near-sighted“ can’t focus on faraway objects because the curvature of the person's eye-lens is too great. This causes parallel rays to bend too much and focus in front of the retina. The person sees a fuzzy patch of light rather than a sharp point.f too short This person needs eyeglasses with lenses that areA) converging B) divergingC) either converging or diverging, depending on much correction is needed.36-7Which of the following changes its focal length when it is immersed in water?A. a concave mirrorB. a convex mirrorC. a diverging lensD. all of the aboveE. none of the aboveA concave mirror with a radius of curvature of 20 cm has a focal length ofA. 40 cm.B. 20 cm.C. 10 cm.D. 5 cm.E. answer depends on the index of refraction of the air around the mirrorAn object is placed 1.5 m away from a concave mirror of focal length +1.0 m. The image formed by the mirror isA. real and larger than the object.B. real and smaller than the object.C. real and the same size as the object.D. virtual and larger than the object.E. virtual and smaller than the
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