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light experiments
exam questions
| Question | Answer |
|---|---|
| why did the student first make an approximate measurement of the focal length? | to ensure that the object was placed outside the focal point//to check final answer |
| How could this graph be used to calculate the focal length? | y-intercept is 1/f |
| Why would a smaller angle of incidence have led to a less accurate measurement of the angle of refraction? | smaller angle leads to greater percentage error |
| state two precautions that should be taken when measuring v | take all measurements from the back of concave mirror//avoid error of parallax by using metre stick when taking measurements//ensure sharp, inverted image of object obtained |
| which more accurate for angle: 500 lines/mm or 80 lines/mm? | 500 lines/mm, larger measurements give smaller percentage error |
| how was a beam of light produced? | adjust width of slit in collimator |
| using a graph to calculate a value for the refractive index is a more accurate method than calculating the refractive index for each pair of angles and then finding mean? | -slope gives weighted mean -outliers can be identified |
| why is it difficult to measure image distance accurately? | difficult to locate sharp image |
| student didn't record any values below 30 degrees, explain why | smaller angles mean greater percentage error, difficult to measure small angles |
| explain how a diffraction grating of 500 lines/mm leads to a more accurate result | greater angular separation between fringes leads to a smaller percentage error |
Created by:
erina27
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