EXAM 1-FRSC365 QUESTIONS AND VERIFIED CORRECT
ANSWERS GRADED A++
What is light?
-has both properties of a particle and a wave, called duality of light
-has perpendicular electric and magnetic field
What resolution is the best light microscope limited to?
limited to 200 nm
what causes contrast?
scattering of waves and depends on interference to give different shades of gray
what do the best microscopes need?
-the most resolution:more detail
-magnification
-good contrast
Why do you need good contrast with microscopes?
-you need to be able to see differently intensities than the background because then it'll
blend together and hard to see.
,true or false:
contrast can be either in different colors or intensities
true
How to calculate frequency?
the number of oscillations per second
What are the types of light
-monochromatic
-polarized
-coherent
-collimated
monochromatic light
one color, one wavelength
polychromatic is more than one color
polarized light
vibrating all in the same direction, linearly polarized
non-polarized is all vibrating in different directions.
coherent light
monochromatic light where all light is in sync
Collimated light
, refers to the directions
collimated is parallel
what are the 4 things that light can do when it hits an object
absorption
reflection
refraction
diffraction
reflection
mirrored surfaces
refraction
refers to the bending of light from one medium to another
two medias have different refractive indices
what is the refractive index
numerical value, affect of transparent objects on the speed of light passing through
them
Low RI to high, velocity of light decreases causes the light to?
bends towards the normal
high to low RI, the velocity of light increases causes the light to?
bends away from the normal
ANSWERS GRADED A++
What is light?
-has both properties of a particle and a wave, called duality of light
-has perpendicular electric and magnetic field
What resolution is the best light microscope limited to?
limited to 200 nm
what causes contrast?
scattering of waves and depends on interference to give different shades of gray
what do the best microscopes need?
-the most resolution:more detail
-magnification
-good contrast
Why do you need good contrast with microscopes?
-you need to be able to see differently intensities than the background because then it'll
blend together and hard to see.
,true or false:
contrast can be either in different colors or intensities
true
How to calculate frequency?
the number of oscillations per second
What are the types of light
-monochromatic
-polarized
-coherent
-collimated
monochromatic light
one color, one wavelength
polychromatic is more than one color
polarized light
vibrating all in the same direction, linearly polarized
non-polarized is all vibrating in different directions.
coherent light
monochromatic light where all light is in sync
Collimated light
, refers to the directions
collimated is parallel
what are the 4 things that light can do when it hits an object
absorption
reflection
refraction
diffraction
reflection
mirrored surfaces
refraction
refers to the bending of light from one medium to another
two medias have different refractive indices
what is the refractive index
numerical value, affect of transparent objects on the speed of light passing through
them
Low RI to high, velocity of light decreases causes the light to?
bends towards the normal
high to low RI, the velocity of light increases causes the light to?
bends away from the normal
