{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# hw23b - aljabr(faa335 Hw23 Ross(89251 This print-out should...

This preview shows pages 1–2. Sign up to view the full content.

aljabr (faa335) – Hw23 – Ross – (89251) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 3) 10.0 points A diverging lens has a focal length of - 24 cm. An object 2 . 82 cm in height is placed 170 cm in front of the lens. Locate the position of the image. Correct answer: - 21 . 0309 cm. Explanation: Basic Concepts: 1 p + 1 q = 1 f m = h h = - q p Diverging Lens 0 > f >p> 0 f <q < 0 0 <m< 1 Solution: Using the thin lens equation 1 p + 1 q = 1 f , with p = 170 cm and f = - 24 cm , we get q = pf p - f = (170 cm) ( - 24 cm) (170 cm) - ( - 24 cm) = - 21 . 0309 cm . The negative sign tells us that the image is virtual. 002 (part 2 of 3) 10.0 points What is the magnification? Correct answer: 0 . 123711. Explanation: The magnification is given by M = - q p = - ( - 21 . 0309 cm) 170 cm = 0 . 123711 . The positive sign of M means that the image is upright and on the same side of the lens as the object. 003 (part 3 of 3) 10.0 points Find the height of the image. Correct answer: 0 . 348866 cm. Explanation: From the formula M = H h , where H is the height of the image and h is the height of the object, we obtain H = M h = (0 . 123711) (2 . 82 cm) = 0 . 348866 cm . 004 10.0 points A converging lens of focal length 0 . 216 m forms a virtual image of an object. The image appears to be 0 . 912 m from the lens on the same side as the object. What is the distance between the object and the lens? Correct answer: 0 . 174638 m. Explanation: Basic Concepts: 1 p + 1 q = 1 f m = h h = - q p Converging Lens f > 0 >p> f f <q< 0 >m> -∞ f >p> 0 -∞ <q< 0 >m> 1 The image appears on the same side as the object, so q is negative: 1 p = 1 f - 1 q 1 p = 1 0 . 216 m + 1 0 . 912 m = 1 5 . 72612 m 1 p = 0 . 174638 m .

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}