Images Formed by Lenses

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Physics 1161 – Lecture 23 Lenses

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Presentation transcript:

Images Formed by Lenses Diverging

Review - Lens Terminology The principal focus is on the SAME side as the incident rays

Three Key Rays: 1. Light rays that go in parallel to the PA F 2F F’ 2F’ 1. Light rays that go in parallel to the PA refract as though they came from F.

Three Key Rays: 2. Light rays that go towards F’ refract parallel to the PA

Three Key Rays: 3. Light rays that go in through O don’t refract F 2F

Finding Images smaller Size: _____________ Attitude: ____________ The refracted rays diverge so we have to F 2F F’ 2F’ extend the rays back image smaller Size: _____________ Attitude: ____________ Location: _________ Type: _______________ upright closer virtual

Finding Images Same as before smaller Size: _____________ Attitude: ____________ Location: _________ Type: _______________ upright closer virtual