Concept Test - Reflection, Mirror, Refraction - Solved Examples | Phys 214, Exams of Physics

Download Concept Test - Reflection, Mirror, Refraction - Solved Examples | Phys 214 and more Exams Physics in PDF only on Docsity! ConcepTest 23.1 Reflection When watching the Moon over the ocean, you often see a long streak of light on the surface of the water. This occurs because: 1) the Moon is very large 2) atmospheric conditions are just right 3) the ocean is calm 4) the ocean is wavy 5) motion of the Moon When the water surface changes, the angle of incidence also changes. Thus, different spots on the water can reflect the Moon into your eyes at different times. ConcepTest 23.1 Reflection When watching the Moon over the ocean, you often see a long streak of light on the surface of the water. This occurs because: 1) the Moon is very large 2) atmospheric conditions are just right 3) the ocean is calm 4) the ocean is wavy 5) motion of the Moon Follow-up: Where else does this occur? ConcepTest 23.2b Mirror II You stand in front of a mirror. How tall does the mirror have to be so that you can see yourself entirely? 1) same as your height 2) less than your full height but more than half your height 3) half your height 4) less than half your height 5) any size will do ConcepTest 23.2b Mirror II Trace the light rays from the image’s foot to the mirror and then to the eye. Since we know that θ i = θ r , you need a mirror only half your size. You stand in front of a mirror. How tall does the mirror have to be so that you can see yourself entirely? 1) same as your height 2) less than your full height but more than half your height 3) half your height 4) less than half your height 5) any size will do ConcepTest 23.2c Mirror III Does this depend on your distance from the mirror? 1) No. 2) Yes. 3) Depends on the mirror. 4) Depends on the person. The image of the face reflected in the small mirror appears 0.5 m behind the small mirror. This image (which is the object for the big mirror) is 2.0 m away from the big mirror. The final image is 2.0 m behind the big mirror. ConcepTest 23.3 All Smoke and Mirrors 1.0 m 0.5 m 1) 0.5 m 2) 1.0 m 3) 1.5 m 4) 2.0 m 5) 2.5 m You hold a hand mirror 0.5 m in front of you and look at your reflection in a full-length mirror 1 m behind you. How far in back of the big mirror do you see the image of your face? ConcepTest 23.4a Refraction I 1 air air Parallel light rays cross interfaces from air into two different media, 1 and 2, as shown in the figures below. In which of the media is the light traveling faster? 1) medium 1 2) medium 2 3) both the same 2 ConcepTest 23.4a Refraction I 1 air air The greater the difference in the speed of light between the two media, the greater the bending of the light rays. Parallel light rays cross interfaces from air into two different media, 1 and 2, as shown in the figures below. In which of the media is the light traveling faster? 1) medium 1 2) medium 2 3) both the same 2 Follow-up: How does the speed in air compare to that in 1 or 2? ConcepTest 23.5a Gone Fishin’ I To shoot a fish with a gun, should you aim directly at the image, slightly above, or slightly below? 1) aim directly at the image 2) aim slightly above 3) aim slightly below ConcepTest 23.5a Gone Fishin’ I Due to refraction, the image will appear higher than the actual fish, so you have to aim lower to compensate. To shoot a fish with a gun, should you aim directly at the image, slightly above, or slightly below? 1) aim directly at the image 2) aim slightly above 3) aim slightly below ConcepTest 23.5b Gone Fishin’ II 1) aim directly at the image 2) aim slightly above 3) aim slightly below To shoot a fish with a laser gun, should you aim directly at the image, slightly above, or slightly below?