Chapter 17 - Light and Image Formation
Chapter 17 - Light and Image Formation Chapter 17 - Light and Image Formation
Announcements Reflection and Refraction Image Formation Final QuestionsQuestionA converging lens has a focal length of 10.0 cm. An object is placed 30.0 cm from the lens. Find the imagedistance and describe the image.AnswerBecause the lens is a converging lens, its focal length is positiveWe expect the possibilities of both real and virtual imagesUsing the thin lens equation 1/p + 1/q = 1/f and solving for q we find thatq =( 1f= +15.0 cm−p) 1 −1 ()1=10.0 cm − 1 −130.0 cmBecause this image distance is positive, the image is realThe magnification of the image isM = − q p= −15.0cm30.0 cm = −0.500The magnification of the image tells us that the image is reduced in height by one half, and the negativesign for M tells us that the image is invertedLight and Image Formation
Announcements Reflection and Refraction Image Formation Final QuestionsQuestionA diverging lens has a focal length of 10.0 cm. An object is placed 30.0 cm from the lens. Find the image distanceand describe the image.Light and Image Formation
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Announcements Reflection <strong>and</strong> Refraction <strong>Image</strong> <strong>Formation</strong> Final QuestionsQuestionA diverging lens has a focal length of 10.0 cm. An object is placed 30.0 cm from the lens. Find the image distance<strong>and</strong> describe the image.<strong>Light</strong> <strong>and</strong> <strong>Image</strong> <strong>Formation</strong>
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