Sam holds a lit match in front of a lens (f = 20.0 cm). The distance between the

ID: 584169 • Letter: S

Question

Sam holds a lit match in front of a lens (f = 20.0 cm). The distance between the match and the lens is so = 30.0 cm.

Answer these three questions using three signifcant figures.

Part A: Pick the selection that describes the characteristics of the image from the match.

a. real and upside down

b. real and erect

c. virtual and upside down

d. virtual and erect

Part B: What is the value of the image distance?

Part C: If the flame is actually 1.500 cm tall, how tall is the image of the flame? (Enter your answer as a positive number.)

B) LENS EQUATION 1/f = 1/s+1/s'

1/s' = 1/f-1/s

s' = fs/s-f

s' = 20*30/10 = 60 cm

a) so image distance is positive so that image is real

real images are always upside down

c) magnification m = -s'/s = y'/y

y' = s'y/s = 60*1.5/30 = 3 cm

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