OMI lab 2 Exam Study With Complete Questions And Answers.
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Module
OMI.
Institution
OMI.
Polarisation-What happens to the colour of the torch light in milky water? - correct answer Turns yellow/orange Particles inside the milky water cause light scattering
Shorter wavelengths (blue) leave the light source first and scatter into the milk
Long...
OMI lab 2
Polarisation-What happens to the colour of the torch light in milky water? - correct answer
Turns yellow/orange Particles inside the milky water cause light scattering
Shorter wavelengths (blue) leave the light source first and scatter into the milk
Longer wavelengths remain in the light source and pass through
Polarisation-Why does torch light appear more yellow as we add more milk? - correct answer
More milk = more light scatter Short wavelengths (blue) scatters more into milk, causing the torch light
to appear more yellow (as it has a longer wavelength) and the milk to appear more blue
Polarisation-Why would using a red light source not work? - correct answer Red
only contains long wavelength light
Long wavelength light is more difficult to scatter and lack the full range of wavelengths (as with white
light)
There are no short wavelength (blue) light to scatter and make milk blue
Polarisation problems-> light source doesn't turn yellow but milk turns blue - correct answer
1.light source producing diffuse light
Angle the light source downwards towards the table or change the light source
2. not added enough milk
, Polarisation problems- light source disappear when milk is added - correct answer
1. too much milk is added
2. light source is too low
Camera obscura-How does the pinhole produce an upside down image? - correct answer
Light travels in a straight line through the pinhole
However a pinhole is very small, therefore: From the tip of the object appears at the bottom of the
image
From the bottom of the object appears at the top of the image
Camera Obscura-Will the image also be flipped left-right? - correct answer Yes the
image will be laterally reversed because light travels in a straight line through the pinhole so light
travelling from the right will end up on the left, and light travelling from the left will be on the right of
the image.
Camera Obscura- What happens to image size and appearance if distance between screen and pinhole
increases? - correct answer Image size increases
Image appears less bright because light is spread over a larger area
Camera Obscura- What happens to image size and appearance if distance between screen and pinhole
decreases? - correct answer Image size decreases
Image appears brighter because light is spread over a smaller area
Camera Obscura-
How does increasing the distance between screen and pinhole produce a larger image? - correct answer
If object is still, angle of rays on the other side of the pinhole remain constant
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