Question 22 (1 point) An object is 15.0 cm from a convex lens. Its image is 12.0 cm from the lens on the other side. What is the focal length of the lens?

Question 22 options:

1.25 cm

8.6 cm

6.67 cm

27.0 cm

Question 23 (1 point)
The height of an object is 10 cm, and the height of its image is 6 cm. What is the magnification?

Question 23 options:

4

16

0.6

1.67

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day

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