Predict what would happen to the image on the screen if you remove the lens from
ID: 1558339 • Letter: P
Question
Predict what would happen to the image on the screen if you remove the lens from the optical bench, but kept everything similar to case (1). Do you expect the image to be there on the screen but fuzzier? Why or why not? Explain. Now do the experiment and comment on what you observe. What was the role of the lens in image formation of the object?
Previous Questions/Information on Set-Up of Lab:
Before you turn on the source of light, write down the voltage reading VO displayed on the multimeter due to the spurious light in the room ( background light). You will have to subtract this from the voltage reading obtained after turning the light source on. Then, turn on the source of light behind the slide (first step on the moon), and have the lens and the photocell in front of the light source. Hold the white screen just in front of the photocell to see the image clearly. Take the voltage reading on the multimeter and subtract it from VO to get the voltage due to the light intensity of the image of the "first step on moon" slide on the screen.
(2) Predict what would happen if you covered half of the lens with the cover so that the light is passing through only half of the lens. Do you expect the image of the "first step on moon" to get cut in half. Why or why not? You must be very clear about your reasoning. Now do the experiment by covering half the lens. What do you observe on the photocell (put the white screen in front to make the image clear)? If you do not see what you expected, please provide a reasoning for what you observed based upon what you learned in the class.
Explanation / Answer
As seen in the case 1 (refering to what is mentioned in the paragraph),the lens is converging the light source on the photocell so that it can produce more voltage but since now lens is removed we can say that photocell will still provide the voltage but very less as compared to case 1 as now light intensity will be less on it as lens was collecting light and converging it to photocell so voltage produced by photocell will decrease as compared to case 1