MIRRORS. ACTUAL light path APPARENT light path OBJECTIMAGE: same size, equal distance behind normal 1. PLANE (FLAT) MIRROR VIEWER Law of Reflection: equal.

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Presentation transcript:

MIRRORS

ACTUAL light path APPARENT light path OBJECTIMAGE: same size, equal distance behind normal 1. PLANE (FLAT) MIRROR VIEWER Law of Reflection: equal angles

PLANE MIRROR: UPRIGHT, SAME SIZE, VIRTUAL

PERISCOPES

Using mirrors Two examples: 1) A periscope 2) A car headlight

CONVEX AND CONCAVE MIRRORS

normal focus Concave mirrors are CONVERGING CONCAVE MIRROR

virtual focus Convex mirrors are DIVERGING CONVEX MIRROR

Convex and Concave Mirrors A concave mirror is a converging mirror. Parallel rays of light are reflected through the focal point of a concave mirror. A convex mirror is a diverging mirror. Parallel rays of light are reflected so that they appear to come from the focal point of a convex mirror.

Uses of Concave Mirrors Used to collect light energy, sound, heat, radiation, radar and TV signals. If you move close to a concave mirror, then you see a magnified image of yourself. This image is upright and virtual as well as magnified. Shaving and make up mirrors

Real image then MAGNIFIED by eyepiece lens 1. CONCAVE MIRROR: OBJECT OUTSIDE F Back to diagram

3. CONCAVE MIRROR: OBJECT INSIDE F Back to diagram

2 CONCAVE MIRROR: OBJECT AT F Used in 2 ways: to project a parallel beam of light from the light source at the focus OR in reverse – to focus incoming (distant) parallel waves

2 CONCAVE MIRROR: OBJECT AT F: light from focus into parallel beam

2 CONCAVE MIRROR: OBJECT AT F: parallel rays brought to focus Solar cooker Solar power station Back to diagram

Uses of Convex Mirrors They always produce virtual upright images. The image is always smaller than the object. They are useful when you want a wide field of view – car driving mirrors or shop security.

CONVEX MIRROR: ALL OBJECT POSITIONS Security mirrors give a view of a wide area

LENSES

TOTAL INTERNAL REFLECTION

Total Internal Reflection This is used in fiber-optic cables to transmit data signals. The light inside the cable cannot escape so no energy (signal) is lost as it travels.

Total Internal Reflection This is used in fiber-optic cables to transmit data signals. The light inside the cable cannot escape so no energy (signal) is lost as it travels.