Ch18.1 Mirrors Concave mirror All light rays that come in parallel to the optical axis, reflect thru the focal point. All light rays that come in thru.

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Ch18.1 Mirrors Concave mirror All light rays that come in parallel to the optical axis, reflect thru the focal point. All light rays that come in thru the focal point, reflect out parallel. the Law of Reflection is always obeyed.

Ch18.1 Mirrors Concave mirror All light rays that come in parallel to the optical axis, reflect thru the focal point. All light rays that come in thru the focal point, reflect out parallel. the Law of Reflection is always obeyed. center of focaloptical axis curvature point The center of curvature (radius of curvature) = twice the focal length C = 2f

Equations: Lens/Mirror Equation: focalobject image length distance distance - when d i = (+)  real image - when d i = (–)  virtual image

Equations: Lens/Mirror Equation: focalobject image length distance distance - when d i = (+)  real image - when d i = (–)  virtual image Magnification Eqns: image height object height - when h i is (+) image is upright - when h i is (–) image is inverted

Ex1) Find the image of a 2 cm tall object placed 11 cm in front of a concave mirror with a focal length of 5 cm.

Ex1) Find the image of a 2 cm tall object placed 11 cm in front of a concave mirror with a focal length of 5 cm. Real, Inverted, smaller

Ex2) Find the image of a 1 cm tall object placed 5 cm in front of a concave mirror with a focal length of 3 cm.

Ex2) Find the image of a 1 cm tall object placed 5 cm in front of a concave mirror with a focal length of 3 cm. Real, Inverted, larger - when object is: d o > c then d i smaller c > d i > f - when object is: c > d o > f then d i larger Ch18 HW#1 1-4 d i > c

Ch18 HW#1 1 – 4 1) Find the image of a 1 cm tall object placed 10 cm in front of a concave mirror with a focal length of 6 cm.

Ch18 HW#1 1 – 4 1) Find the image of a 1 cm tall object placed 10 cm in front of a concave mirror with a focal length of 6 cm. Real, Inverted, larger

Ch18 HW#1 1 – 4 2) Find the image of a 2 cm tall object placed 10 cm in front of a concave mirror with a focal length of 4 cm.

Ch18 HW#1 1 – 4 2) Find the image of a 2 cm tall object placed 10 cm in front of a concave mirror with a focal length of 4 cm. Real, Inverted, smaller

Ch18 HW#1 1 – 4 3) Find the image of a 2 cm tall object placed 60 cm in front of a concave mirror with a focal length of 30 cm.

Ch18 HW#1 1 – 4 3) Find the image of a 2 cm tall object placed 60 cm in front of a concave mirror with a focal length of 30 cm. Real, inverted, same size

Ch18 HW#1 1 – 4 4) Find the image of a 2 cm tall object placed 8 cm in front of a concave mirror with a focal length of 4 cm.

Ch18 HW#1 1 – 4 4) Find the image of a 2 cm tall object placed 8 cm in front of a concave mirror with a focal length of 4 cm. Real, inverted, same size

Ch18.1 cont Ex1) A 1cm tall object is placed 2cm in front of a concave mirror with a focal length of 4cm. Find the image.

Ch18.1 cont Ex1) A 1cm tall object is placed 2cm in front of a concave mirror with a focal length of 4cm. Find the image. Virtual Upright Larger When the object is placed inside the focal length of a concave mirror, the image is larger and virtual.

Ex2) A 0.5cm tall object is placed 2cm in front of a concave mirror with a center of curvature of 6cm. Find the image.

Ex2) A 0.5cm tall object is placed 2cm in front of a concave mirror with a center of curvature of 6cm. Find the image. Virtual Upright Larger

Plane Mirrors - focal length at infinity - always form virtual images - image is same height and distance behind mirror Ex3) A 2cm tall object is placed 3.5cm in front of a plane mirror. Find the image.

Plane Mirrors - focal length at infinity - always form virtual images - image is same height and distance behind mirror Ex3) A 2cm tall object is placed 3.5cm in front of a plane mirror. Find the image. Virt,up,same Ch18 HW#2

Ch18 HW#2 5 – 7 5. A 1cm tall object is placed 3cm in front of a concave mirror with a focal length of 5cm. Find the image.

Ch18 HW#2 5 – 7 5. A 1cm tall object is placed 3cm in front of a concave mirror with a focal length of 5cm. Find the image. Virtual Upright Larger

Ch18 HW#2 5 – 7 6. (Scaled 3:1) A 3cm tall object is placed 6cm in front of a concave mirror with a focal length of 18cm. Find the image.

Ch18 HW#2 5 – 7 6. (Scaled 3:1) A 3cm tall object is placed 6cm in front of a concave mirror with a focal length of 18cm. Find the image. Virtual Upright Larger

7. A 2cm tall object is placed 5cm in front of a plane mirror. Find the image.

7. A 2cm tall object is placed 5cm in front of a plane mirror. Find the image. Virt,up,same

Ch18.2 Convex Mirrors Ex1) A convex security mirror at ur local minimart catches u taking a 5-finger discount from the twinkies. If the mirror has a radius of curvature of 7m, u r 2 m tall, standing 5m in front of the mirror, find ur image.

Ch18.2 Convex Mirrors Ex1) A convex security mirror at ur local minimart catches u taking a 5-finger discount from the twinkies. If the mirror has a radius of curvature of 7m, u r 2 m tall, standing 5m in front of the mirror, find ur image. Virtual Upright Smaller

Ex2) A 2.5cm object is placed 4cm in front of a convex mirror with a focal length of -3cm. Find the image.

Ex2) A 2.5cm object is placed 4cm in front of a convex mirror with a focal length of -3cm. Find the image. Virtual Upright Smaller Ch18 HW#3 8 – 10

8. A 10cm object is placed 20cm in front of a convex mirror with a focal length of -15cm. Find the image. (Scaled 5:1)

Ch18 HW#3 8 – A 10cm object is placed 20cm in front of a convex mirror with a focal length of -15cm. Find the image. (Scaled 5:1) Virtual Upright Smaller

9. A 2.5cm object is placed 6cm in front of a convex mirror with a focal length of -2cm. Find the image.

9. A 2.5cm object is placed 6cm in front of a convex mirror with a focal length of -2cm. Find the image. Virtual Upright Smaller

10. A 2cm object is placed 4cm in front of a convex mirror with a focal length of -4cm. Find the image.

10. A 2cm object is placed 4cm in front of a convex mirror with a focal length of -4cm. Find the image. Virtual Upright Smaller

Ch18 Mirror Constructions 1. Find the image of a 2cm tall object placed 7cm in front of a concave mirror with a focal length of 3 cm.

2. A 1.0cm tall object is placed 1.5cm in front of a concave mirror with a focal length of 3cm. Find the image.

2. A 1.0cm tall object is placed 1.5cm in front of a concave mirror with a focal length of 3cm. Find the image. Virtual Upright Larger

3. A 2cm tall object is placed 4.5cm in front of a plane mirror. Find the image.

3. A 2cm tall object is placed 4.5cm in front of a plane mirror. Find the image. Virt,up,same

4. Find the image of a 2cm tall object placed 10cm in front of a concave mirror with a focal length of 4 cm.

4. Find the image of a 2cm tall object placed 10cm in front of a concave mirror with a focal length of 4 cm. Real, Inverted, smaller

5. A 2.5cm object is placed 2cm in front of a convex mirror with a focal length of -3cm. Find the image.

5. A 2.5cm object is placed 2cm in front of a convex mirror with a focal length of -3cm. Find the image. Virtual Upright Smaller

6. Find the image of a 0.2cm light bulb placed 5cm in front of a concave mirror with a focal length of 5 cm.

6. Find the image of a 0.2cm light bulb placed 5cm in front of a concave mirror with a focal length of 5 cm. No image

Lab18.1 Mirrors - due tomorrow

Ch18.3 – Convex Lenses Ex1) Find the image of a 1.5cm tall object placed 8cm in front of a convex lens with a focal length of 5 cm.

Ch18.3 – Convex Lenses Ex1) Find the image of a 1.5cm tall object placed 8cm in front of a convex lens with a focal length of 5 cm. Real Inverted Larger

Ex2) Find the image of a 2cm tall object placed 10cm in front of a convex lens with a focal length of 4 cm.

Ex2) Find the image of a 2cm tall object placed 10cm in front of a convex lens with a focal length of 4 cm. Real Inverted Smaller

Ex3) Find the image of a 1cm tall object placed 4cm in front of a convex lens with a focal length of 6 cm.

Ex3) Find the image of a 1cm tall object placed 4cm in front of a convex lens with a focal length of 6 cm. Virtual, Up, Larger Ch18 HW#4 11 – 14

11. Find the image of a 1cm tall object placed 6cm in front of a convex lens with a focal length of 4 cm.

Ch18 HW#4 11 – Find the image of a 1cm tall object placed 6cm in front of a convex lens with a focal length of 4 cm. Real Inv Larger

12. Find the image of a 2cm tall object placed 10cm in front of a convex lens with a focal length of 4 cm.

12. Find the image of a 2cm tall object placed 10cm in front of a convex lens with a focal length of 4 cm. Real Inverted Smaller

13) Find the image of a 1cm tall object placed 2cm in front of a convex lens with a focal length of 4 cm.

13) Find the image of a 1cm tall object placed 2cm in front of a convex lens with a focal length of 4 cm. Virtual, Up, Larger

14) Find the image of a 4cm tall object placed 12cm in front of a convex lens with a focal length of 20 cm. (Scaled 4:1)

14) Find the image of a 4cm tall object placed 12cm in front of a convex lens with a focal length of 20 cm. (Scaled 4:1) Virtual, Up, Larger

Ch18.4 – Concave Lenses Ex1) Find the image of a 2cm tall object placed 6cm in front of a concave lens with a focal length of –4 cm.

Ch18.4 – Concave Lenses Ex1) Find the image of a 2cm tall object placed 6cm in front of a concave lens with a focal length of –4 cm. Virtual, Up, Smaller

Eye Problems Normal Eye focuses light on the retina:

Eye Problems Farsighted – rays meets behind the retina: Fix with:

Eye Problems Nearsighted – rays meets in front of the retina: Fix with: Ch18 HW#5 15 – 18

15. Find the image of a 2cm tall object placed 6cm in front of a convex lens with a focal length of 6 cm.

Ch18 HW#5 15 – Find the image of a 2cm tall object placed 6cm in front of a convex lens with a focal length of 6 cm. No image

16. Find the image of a 2.5cm tall object placed 6cm in front of a concave lens with a focal length of –4 cm.

16. Find the image of a 2.5cm tall object placed 6cm in front of a concave lens with a focal length of –4 cm. Virtual, Up, Smaller

17. Find the image of a 25cm tall object placed 40cm in front of a concave lens with a focal length of –30 cm.

17. Find the image of a 25cm tall object placed 40cm in front of a concave lens with a focal length of –30 cm. Virtual, Up, Smaller

Eye Problems Nearsighted fix with _________ lens:

Eye Problems Nearsighted fix with concave lens:

Ch18 Lens Constructions 1. Find the image of a 1.5cm tall object placed 9cm in front of a convex lens with a focal length of 3cm.

Ch18 Lens Constructions 1. Find the image of a 1.5cm tall object placed 9cm in front of a convex lens with a focal length of 3cm. Real Inverted Smaller

2. Find the image of a 1.5cm tall object placed 5cm in front of a convex lens with a focal length of 3cm.

2. Find the image of a 1.5cm tall object placed 5cm in front of a convex lens with a focal length of 3cm. Real Inverted Larger

3. Find the image of a 1.5cm tall object placed 2cm in front of a convex lens with a focal length of 4cm.

3. Find the image of a 1.5cm tall object placed 2cm in front of a convex lens with a focal length of 4cm. Virtual, Up, Larger

4. Find the image of a 10cm tall object placed 70cm in front of a concave lens with a focal length of –30cm.

4. Find the image of a 10cm tall object placed 70cm in front of a concave lens with a focal length of –30cm. Virtual, Up, Smaller

5. Find the image of a 1cm tall object placed 4cm in front of a convex lens with a focal length of 6cm.

5. Find the image of a 1cm tall object placed 4cm in front of a convex lens with a focal length of 6cm. Virtual, Up, Larger

6. Find the image of a 1.5cm tall object placed 8cm in front of a convex lens with a focal length of 2cm.

6. Find the image of a 1.5cm tall object placed 8cm in front of a convex lens with a focal length of 2cm. Real Inverted Smaller

Lab18.2 – Lenses - due tomorrow

Ch18 Review 1. Find the image of a 1.5cm object placed 9cm in front of a concave mirror with a focal length of 3cm.

Ch18 Review 1. Find the image of a 1.5cm object placed 9cm in front of a concave mirror with a focal length of 3cm.

2. Find the image of a 2.5cm tall object placed 5cm in front of a convex mirror with a focal length of –4cm.

2. Find the image of a 2.5cm tall object placed 5cm in front of a convex mirror with a focal length of –4cm. Virtual Upright Smaller

3. Find the image of a 2cm tall object placed 7cm in front of a convex lens with a focal length of 4cm.

3. Find the image of a 2cm tall object placed 7cm in front of a convex lens with a focal length of 4cm. Real Inv Larger

4. Find the image of a 2.5cm tall object placed 4cm in front of a convex mirror with a focal length of –2cm.

4. Find the image of a 2.5cm tall object placed 4cm in front of a convex mirror with a focal length of –2cm. Virtual, Up, Smaller

5. Find the image of a 10cm tall object placed 20cm in front of a plane mirror.

5. Find the image of a 10cm tall object placed 20cm in front of a plane mirror.