CT0pt 1 A ray of light is bent when it passes from water to air air water This is an example of A Huygen s Principle C The superposition principle B Snell s Law D The lens equation CT0pt 2 A man is looking in a mirror and he sees his face just filling the mirror The man now moves back away from the mirror watching his reflection As he moves back he sees the image of his face A continues to just fill the mirror B becomes smaller than the frame of the mirror C become larger than the frame of the mirror Hint Man Virtual Image CT0pt 3 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 I III II 25 40 A nI nIII 35 25 B nI nIII D Impossible to tell C nI nIII CT0pt 4 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 goes straight thru C bent toward the thick end A B air n 1 glass n 1 5 C CT0pt 5 A light ray passes from air to glass smaller n to larger n as shown Which way does the ray travel in the glass A air n 1 B C glass n 1 5 D CT0pt 6 A light ray inside glass is totally internally reflected from an airglass interface as shown air glass 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 CT0pt 7 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 but still positive D negative CT0pt 8 A bundle of parallel rays approaches the eye and some of the rays enter the eye s pupil as shown below No other rays enter the eye What does the eye see Eye A A single point of light surrounded by blackness B A uniformly illuminated wall of light like a white wall C Many scattered points of light like stars in the night sky D None of these CT0pt 9 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 1 2 screen lens mask A Image 1 vanishes B Image 2 vanishes C Something else happens CT0pt 10 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 between the lens and the image B at the image C further from the lens than the image A B object image lens C CT0pt 11 An object is placed is placed near a diverging lens but the object is further from 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 The magnitude of the image distance compared to the object distance is A smaller B greater Answers The image is virtual and the image distance is smaller than the object distance The only way to understand this is to draw a ray diagram object image optic axis You get the same answers whether or not the object distance is further from the lens than the focal point CT0pt 11 Is the image on a movie screen real or virtual A real B virtual Is the image seen with a virtual reality headset real or virtual A real B virtual Answer When the rays actually converge at a point in space where you can put a screen to see the image then the image is real The image is Real Answers The image must be further than 25cm from the viewer s eye for the viewer to be able to focus on the image The image is Virtual image Q0pt 12 An object is placed closer to a magnifying glass than the focal length image virtual optic axis object di do What are the signs of the focal length f the object distance d o 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 If do 5cm di 15 cm and the object height ho is 1cm what is the image height hi A 2cm B 3cm C 4cm D None of these CT0pt 13 A person who is near sighted or myopic cannot focus on faraway objects objects at infinity because the curvature of the person s eye lens is too great This causes parallel rays from a distant point source 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 CT0pt 14 An object is near a mirror The virtual image formed by the mirror is upright is smaller than the object and is nearer the mirror than the object as shown Is the mirror B concave or C convex mirror object image B A convex concave Hint For a plane mirror the virtual image is the same distance from the mirror as the object Imagine bending the mirror Do the reflected rays bend so the image gets further or closer to the mirror image object CT0pt 15 What s wrong with that scene in 2001 A Astronaut Dave Bowman can t read the screens on his console B He s not weightless C There s no thrust plume coming from his pod D The background stars are moving Ch0pt 16 An astronomical refracting telescope has 3 4 of its objective lens covered with a mask The observer reports that compared to the image with no mask the image is A unchanged B 3 4 covered C the same image but 1 4 as bright D the same image but 1 16 as bright Shorter focal length magnifying glass give bigger virtual image smaller angle smaller image bigger angle bigger image Longer focal length lens produces larger real image far away arrow small image small f far away arrow …
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