Physics equations/25-Geometric Optics/Q:image

pe025OpticsConcepts version A

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1.
Lens1b.svg
Shown is a corrective lens by a person who needs glasses. This ray diagram illustrates
how a nearsighted person might see a distant object
how a nearsighted person might see an object that is too close for comfort
how a farsighted person might see an object that is too close for comfort
how a farsighted person might see a distant object

2.
Lens1 leftRight reversed.svg
Shown is a corrective lens by a person who needs glasses. This ray diagram illustrates
how a nearsighted person might see a distant object
how a farsighted person might see a distant object
how a farsighted person might see an object that is too close for comfort
how a nearsighted person might see an object that is too close for comfort

3. In optics, normal means

to the left of the optical axis
parallel to the surface
perpendicular to the surface
to the right of the optical axis

4. The law of reflection applies to

only light in a vacuum
telescopes but not microscopes
curved surfaces
both flat and curved surfaces
flat surfaces

5. When light passes from air to glass

the frequency decreases
the frequency increases
it bends away from the normal
it bends towards the normal
it does not bend

6. When light passes from glass to air

it does not bend
the frequency decreases
the frequency increases
it bends towards the normal
it bends away from the normal

7. An important principle that allows fiber optics to work is

the invariance of the speed of light
total internal reflection
total external refraction
partial internal absorption
the Doppler shift

8. The focal point is where

rays meet whenever they pass through a lens
rays meet if they were parallel to the optical axis before striking a lens
rays meet whenever they are forming an image
rays meet if they are parallel to each other
the center of the lens

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