hw_ch27 - Ch. 27 HW Solutions 1.) Because the lens takes...

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Unformatted text preview: Ch. 27 HW Solutions 1.) Because the lens takes the parallel rays from the sun and focuses them on a point, the lens is converging. The point at which parallel rays converge is the focus of the lens, 12 cm. 3.) (a) q = 80 cm: real, inverted (b) q = 200 cm: real, inverted (c) q = -40 cm: virtual, upright 4.) (a) q = 100 cm: real, inverted (b) q = 133 cm: real, inverted (c) q = -33.3 cm: virtual, upright 8.) p = 12 cm, q = 4.0 m. f = (1 /p + 1 /q )- 1 = (1 / 12 + 1 / 400)- 1 = 11 . 65 cm. M =- q/p =- 400 / 12 =- 33 . 3 . The image size is magnified 33.3 times, so it is 83.3 cm 116.7 cm (inverted). 14.) q = 80 cm, p = 12 cm. f = (1 /p + 1 /q )- 1 = (1 / 12 + 1 / 80)- 1 = 10 . 4 cm. 15.) f = 80 cm, h i = 2 m = 200 cm, h o = 50 cm. M =- h i /h o =- 200 / 50 =- 4 (real images from converging lenses are inverted). Since M =- q/p =- 4 , q = 4 p . Then 1 /f = 1 / 80 = 1 /p + 1 / 4 p = 5 / 4 p . So (a) p = (5)(80) / 4 = 100 cm. (b) q = 4 p = 400 cm....
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This note was uploaded on 07/16/2011 for the course PHY 2005 taught by Professor Lee during the Summer '08 term at University of Florida.

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hw_ch27 - Ch. 27 HW Solutions 1.) Because the lens takes...

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