What is the vertical dashed line called?

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Presentation transcript:

What is the vertical dashed line called? Which angle is the angle of refraction? Why has refraction taken place? any one from: • light has moved from glass to air / from air to glass • speed of light has changed

Curved mirrors L.O.: Describe images produced by mirrors. Understand how curved mirrors reflect light. Calculate the magnification produced by a mirror. Construct ray diagrams to show the formation of images by concave mirrors. Mention centre of curvature, C. Convex mirror ray diagram ws Graph papers Homework: workbook pages 111 & 112

CONCAVE MIRROR normal focus Concave mirrors are CONVERGING

CONVEX MIRROR virtual focus Convex mirrors are DIVERGING

A virtual image is one which cannot be formed on a screen A real image is one that can be formed on a screen

Practical task (in pairs, 5 minutes) Hold each mirror close to you and look at the image in the mirror. Fill in your table to describe the image. Extension: think possible applications of each type of mirror.

Can we obtain a real image with a converging mirror?

RAY DIAGRAMS FOR CURVED MIRRORS focal length 1. Ray parallel to axis is reflected through the focus 2. Ray through focus is reflected parallel to axis

1. CONCAVE MIRROR: OBJECT OUTSIDE F IMAGE: INVERTED, DIMISHED, REAL uses

Task: 1) An object 3 cm high is placed 9 cm from a concave mirror of focal length 4 cm. Draw a ray diagram on graph paper to find the position, size and nature of the image. Calculate the magnification. 2) An object 3 cm high is placed 6 cm from a concave mirror of focal length 4 cm. Draw a ray diagram on graph paper to find the position, size and nature of the image. Calculate the magnification.

F F focal length

3. CONCAVE MIRROR: OBJECT INSIDE F IMAGE: UPRIGHT, MAGNIFIED, VIRTUAL uses

2 CONCAVE MIRROR: OBJECT AT F IMAGE: PARALLEL RAYS – NO IMAGE uses

Thumb up/down. An image that can be projected on a screen is a virtual image. 2) Concave mirrors can project an image on a screen. 3) Images in convex mirrors are bigger. 4) Images in convex mirrors are inverted. 5) An incident ray travelling parallel to the principal axis will travel through the focus upon reflection. 6) An incident ray travelling though the focus will not be reflected.

Curved mirrors L.O.: Describe images produced by mirrors. Understand how curved mirrors reflect light. Calculate the magnification produced by a mirror. Construct ray diagrams to show the formation of images by concave mirrors. Mention centre of curvature, C. Convex mirror ray diagram ws Graph papers

1. CONVEX MIRROR: OBJECT INSIDE F IMAGE: UPRIGHT, DIMINISHED, VIRTUAL uses

2. CONVEX MIRROR: OBJECT OUTSIDE F IMAGE: UPRIGHT, MAGNIFIED, VIRTUAL (AGAIN) uses

Tasks: Worksheet 2)An object 5 cm high is placed 15 cm from a convex mirror of focal length 10 cm. Draw a ray diagram on graph paper to find the position, size and nature of the image.

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

3. CONCAVE MIRROR: OBJECT INSIDE F Back to diagram

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

The Arnolfini Marriage 1434 Back to diagram The Arnolfini Marriage 1434