1. You wish to design a telescope using an objective lens with f obj = 0.44 m. I
ID: 1263637 • Letter: 1
Question
1. You wish to design a telescope using an objective lens with fobj = 0.44 m. If you use an eyepiece with a magnification of 21, what are the following?
2.The distance from the front of the eye to the retina is about 2.7 cm. If this eye is focused on a newspaper that is 106 cm in front of the eye, what is the focal length of the eye?
1. You wish to design a telescope using an objective lens with fobj = 0.44 m. If you use an eyepiece with a magnification of 21, what are the following? (a) the total magnification of the telescope (Enter a positive value.) 1.19 (b) the length of the telescope 2.The distance from the front of the eye to the retina is about 2.7 cm. If this eye is focused on a newspaper that is 106 cm in front of the eye, what is the focal length of the eye?Explanation / Answer
M = fo/fe * ( 1` + fe/D)
21 = (0.44)/fe * ( 1 + fe/ 0.25)
21*fe = 0.44 + 0.44*fe/0.25
21*fe = 0.44 + 1.76fe
fe = 0.023 m ,----answer
------
L = fo + fe = 0.44+0.023 = 0.463 <----answer
++++++++++++++
2) s = 106
s' = 2.7
1/s + 1/s' = 1/f
f = (s*s')/(s+s') = (2.7*106)/(2.7+106) = 2.63 cm
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.