Hw1 An Object Is Located 30 0 Cm From A Passenger S Side Mirror The Image Formed Is Upright And One Third The Size Of 1 (160.23 KiB) Viewed 42 times
Hw1 An Object Is Located 30 0 Cm From A Passenger S Side Mirror The Image Formed Is Upright And One Third The Size Of 2 (185.02 KiB) Viewed 42 times
HW1: An object is located 30.0 cm from a passenger's side mirror. The image formed is upright and one third the size of the object. (a) Is the image real or virtual? (b) What is the focal length of the mirror? (c) Is the mirror concave or convex? (d) Draw ray diagram Hints: (i) Image is upright, it should be virtual (m > 0) (ii) Use the formula for magnification (iii) Use mirror formula to find focal length (iv) Sign of the focal length determines the nature of mirror 1 1 1 - + - =- | p q f [Answers: (a) Virtual (why?) (b) f=-15 cm (c) convex (why?)]
HW2: A concave cosmetic mirror has a focal length of 60 cm . A 5.0- cm-long mascara brush is held upright 30 cm from the mirror. (a) Determine the location of the image. (Ans: - 60cm) (b) Find the height of the image. (Ans: 10cm) (c) Is the image upright or inverted? Is the image real or virtual? (d) Show the formation of image by drawing ray diagram. 1 1 1 Hints: (a) F +60 cm, p = 30 cm, use -+-=-then, q=- 60 cm p a f (b) Use formula to determine m = +2, then u (c) Virtual and non-inverted (but why?) (d) Draw the diagram yourself (object is inside the focal point)
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