This document provides hints for understanding how lenses work based on the sign diagram rule. It states that parallel rays above and below the principal axis will refract through the lens and meet at the principal focus, while a ray along the principal axis will travel undeviated. It also notes that to use a lens as a magnifying glass, the object must be placed between the principal focus and the lens.

1. PAPER-4-CONSTRUCTION: Worksheet: 3.20.5
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HINT: • As per the sign diagram rule; all parallel rays above and below the principle axis, refract
through the lens to meet at the principle focus.
• The ray along the principle axes travels un-deviated through and through the lens .
• When using a lens as a magnifying glass, the object needs to be placed anywhere between
the principle focus and the lens
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