The objective lens of a refracting telescope has a focal length of 60 cm and the eyepiece a focal length of 8.0 cm. what is the angular magnification of the telescope?

The solution would be like this for this specific problem:

Given:

Focal length of the objective lens (fo) = 60 cm

Focal length of the eyepiece (fe) = 8.0 cm

Find:

angular magnification of the telescope = ?

So, the formula for angular magnification is:

a = f0 / fe

Where fo = objective lens, and fe = eye lens

So, we divide the total length of the objective lens by the total length of the eyepiece:

a = fo / fe

a = 60 cm / 8.0 cm

a = 7.5 cm

Therefore, the angular magnification of the telescope is 7.5 cm.

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