Physical Attributes and Uses of Lens

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Presentation transcript:

Physical Attributes and Uses of Lens S4P1 Students will investigate the nature of light using tools such as mirrors, lenses, and prisms. c. Identify the physical attributes of a convex lens, a concave lens, and a prism and where each is used.

Concave lens 1. A lens that is thicker at the edges than in the middle 2. Skinny middle 3. Think Concave caves in! 4. Objects appear smaller 5. Light bends toward the thick part

A concave mirror has a surface that’s curved inward.

Uses of concave mirrors Concave mirrors are used as reflectors in torches, headlights of cars, scooters etc. Concave mirrors are used by dentists to see enlarged images of teeth. Concave mirrors are used by doctors for examining eyes, ears, nose and throat.

Convex Lens 1. A lens that is thicker in the middle 2. Light bends toward the thick part (middle) 3. Makes objects look larger

A convex mirror has a surface that’s curved outward.

Uses of convex mirrors Convex mirrors are used as side mirrors in cars, scooters etc. Convex mirror has a wider view to help drivers to see the traffic behind them.

Prism An object that causes light waves to change direction.

Convex Lens Design an investigation to determine what happens to light as it passes through a convex lens. Describe the results. A convex lens causes light to converge, or focus, producing an image that is smaller than the original object.

Concave Lens Design an investigation to determine what happens to light as it passes through a concave lens. Describe the results. A concave lens causes light to diverge, or spread out, producing a larger image than the original.

Where Lenses and Prisms Are Used Identify some common optical tools, and describe whether each has lenses, mirrors, and/or prisms in it. These should include: eyeglasses flashlights cameras binoculars microscopes

Eyeglasses: have lenses c. Hyperopia (farsightedness) a. Normal eye b. Myopia (nearsightedness) Corrected with concave lens Corrected with convex lens No correction needed

Flashlight: has lenses and a mirror

Cameras: have lenses, mirrors, and a prism

Binoculars: have lenses and prisms

Microscope: has lenses

Prism Analyze the effects of a prism on white light and describe why this occurs. Explain why a rainbow occurs.