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Angular Magnification in Telescope

In an astrono...

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In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of the objective lens. The eyepiece forms a real image of this line. The length of thsi image is l.The magnification of the telesco

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Q. In an astronomical telescope in normal adjustment, a straight black line of length

L

is drawn on inside part of the objective lens. The eyepiece forms a real image of this line. The length of this image is

l

. The magnification of the telescope is?

Q. An astronomical telescope and a Galilean telescope use identical objective lenses. They have the same magnification, when both are in normal adjustment. The eyepiece of the astronomical telescope has a focal length

f .

Q. An astronomical telescope has focal lengths

100

10

cm of objective and eyepiece lens respectively when final image is formed at least distance of distinct vision,magnification power of telescope will be,

Q. Focal length of objective lens and eyepiece of an astronomical telescope are

100 cm

2 cm

respectively. Find the angular magnification produced in the case of normal adjustment:

Answer the following questions:

(a) For the telescope described in Exercise (a)[A small telescope has an objective lens of focal length

140 c m

and an eyepiece of focal length

5.0 c m

. What is the magnifying power of the telescope for viewing distant objects when

(a) the telescope is in normal adjustment (i.e., when the final image is at infinity)?],

What is the separation between the objective lens and the eyepiece?

(b) If this telescope is used to view a

100 m

3 k m

away, what is the height of the image of the tower formed by the objective lens?

(c) What is the height of the final image of the tower if it is formed at

25 c m

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