A.) A small refracting telescope designed for individual use has an objective le

Question

A.) A small refracting telescope designed for individual use has an objective lens with a diameter of 6 cm and a focal length of 1.325 m what is the f-number of this instrument? (3 sig-figs)

B.) The 200-inch-diameter objective mirror of the Mt. Palomar telescope has an f-number of 3.3. Calculate its focal length f. (two sig-figs and units)

C.) The distance between lens and retina for a normal human eye is about 2.50 cm, and the pupil can vary in size from 2.0 mm to 8.0 mm. What is the range of f-numbers for the human eye? (f-number)min, (f-number)max

Explanation / Answer

A.) A small refracting telescope designed for individual use has an objective lens with a diameter of 6 cm and a focal length of 1.325 m what is the f-number of this instrument? (3 sig-figs)

fnumber = f/D = 1.325/0.06 = 22.08

B.) The 200-inch-diameter objective mirror of the Mt. Palomar telescope has an f-number of 3.3. Calculate its focal length f. (two sig-figs and units)

f = fumber*D = 660 inch = 16.764 m

C.) The distance between lens and retina for a normal human eye is about 2.50 cm, and the pupil can vary in size from 2.0 mm to 8.0 mm. What is the range of f-numbers for the human eye? (f-number)min, (f-number)max

D = 2.0mm to 8.0mm

f = 250 mm for normal eye

f number = from 125 to 31.25

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