In an experiment to demonstrate a property of light, three cardboards, A, B, and C with holes in their centres are arranged in a straight line between a lighted bulb and an observer as shown in the illustration below.
Study the illustration carefully and use it to answer the question that follow:
i)
What would the observer see from the position shown?
ii)
What would the observer see when cardboard B is slightly displaced from the line?
iii)
Explain the observation made in (a) (ii) above.
iv)
What would be observed when the cardboard B is brought back to its original position?
v)
What property of light is being demonstrated in this experiment?
vi)
Mention
α)
two natural occurrences that could be explained by the property of light demonstrated.
β)
one device that works on the property of light demonstrated.
The diagram below is an illustration of a scientific phenomenom which occurs in nature.
Study the diagram carefully and answer the questions that follow.
i)
What phenomenom does the diagram illustrate?
ii)
Identify each of the parts labelled I, II, III, IV and V.
iii)
Explain why an object at the bottom of a pond appears closer to the surface than it actually is.
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