Both questions. Thx 10. [4 pts.) A person views an object located at her near po

Question

Both questions. Thx

10. [4 pts.) A person views an object located at her near point through a converging lens, as shown below: The drawing is to scale, and shows the distance between the object and the eye along with the local points of the converging lens. What is the angular magnification as seen by the observer? TT 20 mm (a) 0.5 (b) 0.9 (c) 1.9 (d) 2.2 (e) 3.8 11. [4 pts.] A terrestrial telescope of magnification +20 is to be constructed with two lenses. The objective's focal length is 500 mm. You must determine the characteristics of the eyepiece lens, and then answer: How long should the telescope be, that is, what is the distance L in the diagram below? Objective Eyepieco (what type?) (a) Concave (b) Concave 525 mm (c) Convex 475 mm (d) Convex 525 mm (e) Not enough information to determine. 475 mm

Explanation / Answer

from the figure,

near point distance, D = 11*20 mm = 220 mm

focal length, f = 5*20 = 100 mm

angular magnification, M = D/f = 220/100

Angular magnification = 2.2 , OPTION D

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11) given m = 20, fo = 500 mm, fe = ? L = ?

from linear magnification, m = fo/fe

fe = fo/m = 500/20 = 25 mm

now use length L = fe + fo = 25 + 500

L = 525 mm, Convex, option D
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