Question

A 20 cm tall object is located 70 cm away from a diverging lens that has a focal length of 20 cm. Use a scaled ray tracing to answer parts a-d. a. Is the image real or virtual? b. Is the image upright or inverted? c. How far from the lens is the image? d. What is the height of the image? e. Now use the thin lens equation to calculate the image distance and the magnification equation to determine the height of the image. Does this answer match your ray tracing?

A 20 cm tall object is located 70 cm away from a diverging lens that has a focal length of 20 cm. Use a scaled ray tracing to answer parts a-d.

a. Is the image real or virtual?

b. Is the image upright or inverted?

c. How far from the lens is the image?

d. What is the height of the image?

e. Now use the thin lens equation to calculate the image distance and the magnification equation to determine the height of the image. Does this answer match your ray tracing?

Answer 1

a)

image formed by diverging lens is always virtual and upright

b)

upright

c)

using lens image

1/f = 1/v - 1/u

- 1/20 = 1/v + 1/70

v = 15.56 cm

d)

h' = h v/u = 20* 15.56 / 70 = 4.44

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