Lesson P4 Part 2 ~ Lenses & Refraction

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Presentation transcript:

Lesson P4 Part 2 ~ Lenses & Refraction UNIT 3 ~ PHYSICS Lesson P4 Part 2 ~ Lenses & Refraction

Refraction & Lenses When a light ray moves from air into a denser material, it bends towards the normal. When a light ray moves from a denser material into air, it bends away from the normal. A lens is a curved piece of material that refracts light to converge or diverge light rays.

Concave Lenses Concave lenses are thinner in the middle than at the edges. Light rays that pass through a concave lens diverge.

Concave Lenses Image is always smaller and upright no matter how far away from the lens it is.

Convex Lenses Convex lenses are thicker in the middle than at the edges. Light rays that pass through a convex lens converge. The distance from the focal point to the lens or mirror is called the focal length.

Convex Lenses Size and orientation of the image depends on how far the object is from the lens. More than 2 focal lengths smaller & inverted. Between 1 & 2 focal lengths larger & inverted. Object at focal length no image. Less than one focal length larger & upright.