israel8471
03.02.2022 •
Physics
I'm rather stumped on this Ohms law worksheet
number 7. and 8. specifically.
Solved
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Ответ:
fe = 2.1 cm
Explanation:
Given that,
focal length of objective = fo = 19.4 ;
diameter of Jupiter = d = 1.38 x 10^5 km
θo = 12°
distance from earth = o = 6.28 x 10^8 km
we need to determine the focal length of eye piece fe.
The given diameter of Jupiter will act as the perpendicular of right angled triangle, and the base will be the distance. Using trigonometry we can find the angle subtended by objective.
tanθe = 1.38 x 10^5 km / 6.28 x 10^8 km = 0.0002197
θe = 0.013°
we know that, magnification is given by:
m = θe/θo = 12 / 0.013 = 923
Also, m = fo / fe
=> fe = fo / m = 19.4/923 = 0.021 m = 2.1 cm
Hence, fe = 2.1 cm