Unit 8, Lesson 7 Convex Lenses.

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Presentation transcript:

Unit 8, Lesson 7 Convex Lenses

concave convex (Diverging) lens (Converging) lens

Convex (converging) lens f f Principle axis

Image through a convex lens Try This: Describe the image if do = 1.5f and f = 20 cm. Image Characteristics: do = 30 cm size – location – type – attitude – larger further real inverted f f 10 min

Image through a convex lens Try This: Describe the image if do = 0.5f and f = 20 cm. Image Characteristics: do = 10 size – location – type – attitude – larger further virtual upright 10 min f f

Brain Break!

convex lens calculations Example: Describe the image if do = 1.5f and f = 20 cm. do = 30cm 1 f 1 do 1 di = + 1 f 1 do 1 di = + hi ho -di do M = = 1 20 1 30 1 di = + 1 1 20 1 30 1 60 = - = di Image Characteristics: 5 min di = 60 cm size – location – type – attitude – bigger 60 cm opposite -di do -60 30 M = = = - 2X real inverted

convex lens calculations Try This: Describe the image if do = 0.5f and f = 20 cm. do = 10cm 1 f 1 do 1 di = + 1 f 1 do 1 di = + hi ho -di do M = 1 20 1 10 1 di = = + 1 1 20 1 10 1 -20 = - = di 10 min Image Characteristics: di = -20 cm size – location – type – attitude – bigger 20 cm on same side -di do -(-20) 10 M = = = 2X virtual upright

Homework: Pg. 252 #5 and 6 10 min

Unit 8, Lesson 8 Concave Lenses

Concave (Diverging) lenses f

Ray Rules for concave lenses Principle axis

Try This: Locate and characterize an image formed in a diverging lens of focal length 10 cm if do = 15 cm. (Show using a ray diagram + equations.) f f 1 f 1 do 1 di = + 20 min 1 -10 1 15 1 di = + Image Characteristics: 1 1 -10 1 15 1 -6 = - = size – location – type – attitude – smaller di = -6 cm di 6 cm on same side virtual -di do -(-6) 15 M = = = +0.4X upright

Brain Break!

Example: Where should an object be placed if an upright virtual image half its size is to be formed by a concave lens of focal length 10 cm? 1 -10 1 do 1 di 1 -10 1 do 1 -0.5do = + = + -di do 1 2 M = = 1 1 do 2 do -1 do = - = -10 di = -0.5do do = 10 cm 15 min f

Homework: Optics Review sheet! 10 min