Objective diameter: 50 mm (2 inches) Objective focal length: 500 mm (f/10) Eyepi

Question

Objective diameter:

50 mm (2 inches)

Objective focal length:

500 mm (f/10)

Eyepiece focal length:

20 mm

Magnification:

25x (50x with Barlow)

Field of view:

11/2 (3/4 with Barlow)

Eyepiece eye relief:

16 mm (22 mm with Barlow)

Eyepiece barrel diameter:

11/4 inches (313/4 mm)

Objective diameter:

50 mm (2 inches)

Objective focal length:

500 mm (f/10)

Eyepiece focal length:

20 mm

Magnification:

25x (50x with Barlow)

Field of view:

11/2 (3/4 with Barlow)

Eyepiece eye relief:

16 mm (22 mm with Barlow)

Eyepiece barrel diameter:

11/4 inches (313/4 mm)

Explanation / Answer

a)G=f obj/f eyepiece

b)Gauss's 1/f=1/s+1/s'

c)M-y'/y=-s'/s

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