Essential Question

How do convex/concave mirrors and lenses produce different images?

Images

Real Images

• image that can be projected

• ex: movies, images from projectors

  • forms beyond focal point

Virtual Images

• image of an object that your brain perceives

• ex: reflection in the mirror

  • forms between the focal point and mirror

• Focal Point

  • point where light rays reflected from a mirror/lens converge

Mirrors

Reflection

• Regular

  • reflection of light on smooth surface

  • travel back in the same direction they came

• Diffused

  • reflection of light on rough surface

  • rays reflect in all directions

Mirrors

Concave Mirrors

• curve inwards

• converge light rays

• examples: headlights, telescopes

• produce

  • real images

    • inverted images that are smaller or same size

    • upright images that are magnified

Mirrors

Convex Mirrors

• curve outward

• diverge light rays

• examples: rear-view mirrors, bus mirrors

• produce

  • Virtual images (always)

    • smaller/upright images

Lenses

Refraction

• bending of waves as they travel through different mediums

  • causes change in speed of wave

Lenses

Concave Lenses

• thicker at edges than in middle

• diverges light

• examples: binoculars, flashlights, cameras

• ALWAYS produce

  • upright/diminished virtual images

Lenses

Convex Lenses

• thicker in middle than at edges

• converges light

• examples: human eye, microscopes, magnifying glasses

• produce

  • real and inverted

  • virtual and upright