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Simple Nature - Light and Matter

Simple Nature - Light and Matter

Simple Nature - Light and Matter

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ExercisesExercise 12A: Exploring Images With a Curved MirrorEquipment:concave mirrors with deep curvatureconcave mirrors with gentle curvatureconvex mirrors1. Obtain a curved mirror from your instructor. If it is silvered on both sides, make sure you’reworking with the concave side, which bends light rays inward. Look at your own face in themirror. Now change the distance between your face <strong>and</strong> the mirror, <strong>and</strong> see what happens.Explore the full range of possible distances between your face <strong>and</strong> the mirror.In these observations you’ve been changing two variables at once: the distance between theobject (your face) <strong>and</strong> the mirror, <strong>and</strong> the distance from the mirror to your eye. In general,scientific experiments become easier to interpret if we practice isolation of variables, i.e., onlychange one variable while keeping all the others constant. In parts 2 <strong>and</strong> 3 you’ll form an imageof an object that’s not your face, so that you can have independent control of the object distance<strong>and</strong> the point of view.2. With the mirror held far away from you, observe the image of something behind you, overyour shoulder. Now bring your eye closer <strong>and</strong> closer to the mirror. Can you see the image withyour eye very close to the mirror? See if you can explain your observation by drawing a raydiagram.——————–> turn pageExercises 811

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