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

---

Definitions:

Control Variable

An element that is kept constant or regulated to minimize its impact on the outcome of an experiment.

Naturalistic Observation

An investigative technique where individuals are watched in their natural surroundings without any interference from the person conducting the study.

Playgrounds

Outdoor areas designed for children to play, often equipped with recreational structures like slides and swings.

Researcher

A person who conducts academic or scientific studies to gain new knowledge and understanding in a specific field.