Part A Problem 21.70 How high do the type characters appear if you hold the lens

Question

Part A Problem 21.70 How high do the type characters appear if you hold the lens 1.1 cm from the newspaper? Express your answer to two significant figures and include the appropriate units You're using a concave lens with f=-50 cm to read 5.0 mm high newspaper type. hValue Units Part B How high do the type characters appear if you hold the lens 3.7 cm from the newspaper? Express your answer to two significant figures and include the appropriate units. Part C How high do the type characters appear if you hold the lens 12 cm from the newspaper? Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

(A) f= - 5 cm

p = 1.1 cm

1/f = 1/p + 1 /q

1/-5 = 1/1.1 + 1 /q

q = - 0.902

m = -q / p = hi /ho

0.902 / 1.1 = h / 5

h = 4.10 mm

(B) p = 3.7 cm

q = - 2.13

2.13 / 3.7 = h / 5

h = 3.11 mm

(c) p = 12 cm

q = -3.53

h = 1.47 mm

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