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OMI lab 2 Exam Study With Complete Questions And Answers.
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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...

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  • September 16, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • omi lab 2

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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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