Ch. 18 Mirrors and Lenses

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# Ch. 18 Mirrors and Lenses - PowerPoint PPT Presentation

Ch. 18 Mirrors and Lenses. Milbank High School. Sec. 18.1 Mirrors. Objectives Explain how concave, convex, and plane mirrors form images. Locate images using ray diagrams, and calculate image location and size using equations.

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### Ch. 18Mirrors and Lenses

Milbank High School

Sec. 18.1Mirrors
• Objectives
• Explain how concave, convex, and plane mirrors form images.
• Locate images using ray diagrams, and calculate image location and size using equations.
• Explain the cause of spherical aberration and how the effect may be overcome.
• Describe uses of parabolic mirrors.
Plane Mirrors
• Plane mirrors
• Object
• Images
• Virtual Image
Concave Mirrors
• Reflects light from its inner “caved in” surface
• Principal axis
• Focal point
• Focal Length
• Real Images
Concave Mirrors
• Real, inverted images if object is farther from the mirror than the focal point
Calculations…

di is distance from the image to the mirror

d0 is the distance from the object to the mirror

f is focal length of the mirror

• Lens/Mirror Equation:
• Magnification:
• Example problem Pg. 422
• Calculating the Real Image Formed by a Concave Mirror
• Example problem Pg. 424
• A Concave Mirror as a Magnifier
Convex Mirrors
• Reflects light from its outer surface, always diverge
• No real image, upright
• Reduced in size (wide angle mirrors)
Calculations…
• Use same Lens/Mirror Equation
• Focal length is negative
• di is negative (image is behind the mirror)
• Pg. 427 Pr. 6
Sec. 18.2Lenses
• Objectives
• Describe how real and virtual images are formed by convex and concave lenses.
• Locate the image with a ray diagram and find the image location and size using a mathematical model.
• Define chromatic aberration and explain how it can be reduced.
• Explain how optical instruments such as microscopes and telescopes work.
Types of Lenses
• Lens
• Convex lens
• Concave lens
Convex lenses (converging lenses)
• Produce real, inverted images if the object is farther from the lens than the focal point
• If object is closer than the focal point, a virtual, upright, enlarged image is formed
Concave Lenses (diverging lenses)
• Produce virtual, upright, reduced images
Calculations…
• f is positive for convex lenses
• f is negative for concave lenses
• do is positive on the object side of the lens
• di is positive on the other side (image side) of the lens, where images are real
• di is negative on the object side of the lens where images are virtual
• Ex. Prob. Pg 431
• Ex Prob. 434