1. 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

2. 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

3. CONCAVE MIRROR
normal
focus
Concave mirrors are CONVERGING

4. CONVEX MIRROR
virtual focus
Convex mirrors are DIVERGING

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

6. 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.

7. Can we obtain a real image with a converging mirror?

8. 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

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

11. 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.

12. F F
focal length

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

14. 2 CONCAVE MIRROR: OBJECT AT F
IMAGE: PARALLEL RAYS – NO IMAGE
uses

15. 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.

16. 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

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

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

19. 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.

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

21. 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

22. 2 CONCAVE MIRROR: OBJECT AT F: light from focus into parallel beam

23. 2 CONCAVE MIRROR: OBJECT AT F: parallel rays brought to focus
Solar power station
Solar cooker
Back to diagram

24. 3. CONCAVE MIRROR: OBJECT INSIDE F
Back to diagram

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

26. The Arnolfini Marriage 1434
Back to diagram
The Arnolfini Marriage 1434