Sprint 11:59 AM 53961 --+ × 226 test 3 fall 2017.docx 7) The focal point of a th

Question

Sprint 11:59 AM 53961 --+ × 226 test 3 fall 2017.docx 7) The focal point of a thin diverging lens -22.2 cm from the center of lens. A real object is placed 4950cm (d,) from the lens. a) Find the image distance (d) in cm. b) Provide the work to prove the image is R eal or imaginary? c) Show the work to prove if this image is upright and inverted d) Show the word that proves the image is Enlarge, the same size or Reduced 8) Given two conductors (not in contact with each other) that are in a circuit containing two rails and a rod (1.3 m in length) that is connected to the two rails. A large potential difference (V) will produce a spark (in one conductor) that can jump the empty space to the other conductor. The potential difference (V) needed to make a spark jump from one conductor to the other must be approximately 940 V and the space between the two conductors is 1.0x 10 m. If a light bulb is put in the empty space... a) How fast must the rod move in a magnetic field () of 4.8 T to cause the spark to jump open with Print

Explanation / Answer

here,

7)

focal length , f = - 22.2 cm

object distance , do = 4950 cm

a)

let the image distnace be di

using the lens formula

1/f = 1/di + 1/do

- 1/22.2 = 1/di + 1/4950

solving for di

di = - 22.4 cm

b)

as the sign is negative

the image is IMAGINARY

c)

the image is UPRIGHT

d)

magnification , m = - di/do

m = 4.5 * 10^-3

the image is reduced

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