Ch.6 Lens (透鏡).

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Presentation transcript:

Ch.6 Lens (透鏡)

Convex Lens (凸透鏡) and Concave Lens (凹透鏡) A lens is made from _________________ materials usually made of glass. Their surfaces are _______________. (b) There are two types of lenses: _____________ lenses (凸透鏡) and ___________ lenses (凹透鏡) . (c) Convex lenses are thicker in the middle than at the edge. Concave lenses are thinner in the middle. (d) When light rays pass through lens, _______________ occurs.

Convex Lens (凸透鏡) and Concave Lens (凹透鏡) transparent (透明) A lens is made from _________________ materials usually made of glass. Their surfaces are _______________. (b) There are two types of lenses: _____________ lenses (凸透鏡) and ___________ lenses (凹透鏡) . (c) Convex lenses are thicker in the middle than at the edge. Concave lenses are thinner in the middle. (d) When light rays pass through lens, _______________ occurs. curved (彎曲)

Convex Lens (凸透鏡) and Concave Lens (凹透鏡) transparent (透明) A lens is made from _________________ materials usually made of glass. Their surfaces are _______________. (b) There are two types of lenses: _____________ lenses (凸透鏡) and ___________ lenses (凹透鏡) . (c) Convex lenses are thicker in the middle than at the edge. Concave lenses are thinner in the middle. (d) When light rays pass through lens, _______________ occurs. curved (彎曲) convex concave refraction (折射)

convex lenses concave lenses

Optical Centre (光心) and Principal Axis (主軸)

Optical Centre (光心) and Principal Axis (主軸)

Experiment (實驗) 9.1

The refracted rays converges / diverges and meet at a point.

The refracted rays converges / diverges and meet at a point. Convex lens F focus (焦點)

Experiment (實驗) 9.2

The refracted rays converges / diverges and meet at a point.

The refracted rays converges / diverges and meet at a point. Concave lens F focus (焦點)

Focus (焦點) and Focal Length (焦距)

thinner lens => f is longer thicker lens => f is shorter

Class Exercise 9.1 1 cm focal length = ?

Class Exercise 9.1 1 cm focal length = 3 cm (2.8 – 3.2)