33 1 When light passes from vacuum index of refraction n 1 into water n 1 333 A the wavelength increases and the frequency is unchanged B the wavelength decreases and the frequency is unchanged C the wavelength is unchanged and the frequency increases D the wavelength is unchanged and the frequency decreases E both the wavelength and the frequency change 35 2 A 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 n n B n n C nI nIII I II I III D Impossible to tell II I III 35o 25o 40o 25o 35 4 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 know air glass 33 3 Light passes from a medium of index of refraction na into a second medium of index of refraction nb In order for total internal reflection to occur it must be true that A na nb and the incident angle qa is greater than the critical angle B na nb and the incident angle qa is less than the critical angle C na nb and the incident angle qa is greater than the critical angle D na nb and the incident angle qa is less than the critical angle 35 3 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 end B Undeviated C bent toward the thick end A Pink Green B air n 1 glass n 1 5 C Yellow Optics 1 A 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 n3 B n3 n1 n2 C n1 n2 n3 D n3 n2 n1 E n1 n2 n3 Optics 4 A fish swims below the surface of the water at P An observer at O sees the fish at A a greater depth than it really is B the same depth C a smaller depth than it really is 36 4 A 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 A Pink object B Green C Yellow image 36 1 A 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 20cm Optics 2 A lens produces a sharplyfocused inverted image on a screen What will you see on the screen if the lens is removed A B C D E The image will be as it was but much dimmer The image will be right side up and sharp The image will be right side up and blurry The image will be inverted and blurry There will be no image at all 36 2 Two 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 screen 1 2 lens mask A Image 1 vanishes B Image 2 vanishes C Something else happens Optics 3 Which of these actions will move the image point P further from the boundary A B C D Increase the radius of curvature R Increase the index of refraction n Increase the object distance s Decrease the radius of curvature R Optics 4 The image formed by the lens is object f A B C D E Real non inverted Real inverted Virtual non inverted Virtual inverted no image is formed f 36 6 An 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 image virtual object di do 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 5b An 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 5 An 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 Real B Virtual C there is no image 36 7 A person who is near sighted can t focus on faraway objects because the curvature of the person s eyelens 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 are A converging B diverging C either converging or diverging depending on much correction is needed Which of the following changes its focal length when it is immersed in water A a concave mirror B a convex mirror C a diverging lens D all of the above E none of the above A concave mirror with a radius of curvature of 20 cm has a focal length of A 40 cm B 20 cm C 10 cm D 5 cm E answer depends on the index of refraction of the air around the mirror An object is placed 1 5 m away from a concave mirror of focal length 1 0 m The image formed by the mirror is A 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 object
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