Find the Radius of a Star Image Formed on the Retina

question 72

Multiple Choice

Find the radius of a star image formed on the retina of the eye if the aperture diameter (the pupil) at night is 0.70 cm and the length of the eye is 3.2 cm.Assume the wavelength of starlight in the eye is 500 nm.(1 nm = 10−⁹ m)

• A)2.8 × 10−⁴ m
• B)5.6 × 10−⁴ m
• C)3.1 × 10−⁵ m
• D)2.8 × 10−⁶ m
• E)​3.2 × 10−⁴ m

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