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9.5 Option – Communication: 3. Refraction of light in the eye

Syllabus reference (October 2002 version)
3. The clarity of the signal transferred can affect interpretation of the intended visual communication

Students learn to:

Students:

Extract from Biology Stage 6 Syllabus (Amended October 2002). © Board of Studies, NSW.

Prior learning: Stage 4-5 Syllabus, 5.8.4(b) and 5.12 (c)

Background: Light travels in straight lines, but may be bent when it passes from one substance to another. This bending or refraction can be used to increase the clarity of the visual information sent to the brain.


identify the conditions under which refraction of light occurs

Refraction

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identify the cornea, aqueous humor, lens and vitreous humor as refractive media

Process of light being focused on the retina

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plan, choose equipment or resources and perform a first-hand investigation to model the process of accommodation by passing rays of light through convex lenses of different focal lengths

Background
A biconvex lens is shaped as shown in the diagram below. Convex lenses magnify images by causing rays of light to converge.
The lens in the human eye is a convex lens. When parallel rays of light are passed through a convex lens, they will converge at a point, known as the focal point.
The focal length of a lens is the distance of the focal point from the centre of the lens.


Convex lens
Convex lens
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identify accommodation as the focusing of objects at different distances, describe its achievement through the change in strength of the lens and explain its importance

Accommodation
Accommodation
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analyse information from secondary sources to describe changes in the shape of the eye’s lens when focusing on near and far objects

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compare the change in the refractive power of the lens from rest to maximum accommodation

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distinguish between myopia and hyperopia and outline how technologies can be used to correct these conditions

Examples of myopia and hyperopia
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process and analyse information from secondary sources to describe cataracts and the technology that can be used to prevent blindness from cataracts and use available evidence to discuss the implications of this technology for society

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explain how the production of two different images of a view can result in depth perception

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