Section 172 Curved Mirrors in Objective-C

Generate QR in Objective-C Section 172 Curved Mirrors

Section 172 Curved Mirrors
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Concave Mirror Images
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A concave mirror reflects light rays that arrive parallel to the principal axis through the focal point Depending on the object position, different types of images can be formed Real images can be projected onto a screen while virtual images cannot In this experiment you will investigate how changing the object position affects the image location and type
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QUESTION
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What are the conditions needed to produce real and virtual images using a concave mirror
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Collect and organize data of object and
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1 Determine the focal length of your concave mirror by using the following procedure CAUTION: Do not use the Sun to perform this procedure Reflect light from a flashlight onto a screen and slowly move the screen closer or farther away from the mirror until a sharp, bright image is visible Measure the distance between the screen and the mirror along the principal axis Record this value as the actual focal length of the mirror, f 2 On the lab table, set up two metersticks on supports in a V orientation Place the zero measurement ends at the apex of the two metersticks 3 Place the mirror in a mirror holder and place it at the apex of the two metersticks two metersticks four meterstick supports screen lamp with a 15-W lightbulb 4 Using the lamp as the object of the reflection, place it on one meterstick at the opposite end from the apex Place the mirror and the screen, supported by a screen support, on the other meterstick at the opposite end from the apex 5 Turn the room lights off 6 Turn on the lamp CAUTION: Do not touch the hot lightbulb Measure object position, do, and record this as Trial 1 Measure the object height, ho, and record it as Trial 1 This is measured as the actual height of the lightbulb, or glowing filament if the bulb is clear 7 Adjust the mirror or metersticks, as necessary, such that the reflected light shines on the screen Slowly move the screen back and forth along the meterstick until a sharp image is seen Measure image position, di, and the image height, hi, and record these as Trial 1
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image positions Observe real and virtual images Summarize conditions for production of real and virtual images with a concave mirror
Safety Precautions
Do not look at the reflection of the Sun
in a mirror or use a concave mirror to focus sunlight
Materials
concave mirror flashlight screen support mirror holder
Horizons Companies
Data Table
Trial 1 2 3 4 5 do (cm) di (cm) ho (cm) hi (cm)
Calculation Table
Trial 1 2 3 4 5
1 (cm 1) do 1 (cm 1) di 1 do 1 (cm 1) di
fcalc (cm)
% error
8 Move the lamp closer to the mirror so that do is twice the focal length, f Record this as Trial 2 Move the screen until an image is obtained on the screen Measure di and hi, and record these as Trial 2 9 Move the lamp closer to the mirror so that do is a few centimeters larger than f Record this as Trial 3 Move the screen until an image is obtained on the screen Measure di and hi, and record these as Trial 3 10 Move the lamp so that do is equal to f Record this as Trial 4 data Move the screen back and forth and try to obtain an image What do you observe 11 Move the lamp so that do is less than f by a few centimeters Record this as Trial 5 Move the screen back and forth and try to obtain an image What do you observe
Conclude and Apply
1 Classify What type of image was observed in each of the trials 2 Analyze What conditions cause real images to be formed 3 Analyze What conditions cause virtual images to be formed
Going Further
1 What are the conditions needed for the image to be larger than the object 2 Review the methods used for data collection Identify sources of error and what might be done to improve accuracy
Real-World Physics Analyze
1 Use Numbers Calculate 1/do and 1/di and enter the values in the calculation table 2 Use Numbers Calculate the sum of 1/do and 1/di and enter the values in the calculation table Calculate the reciprocal of this number and enter it in the calculation table as fcalc 3 Error Analysis Compare the experimental focal length, fcalc , with f, the accepted focal length, by finding the percent error percent error = What advantage would there be in using a telescope with a concave mirror
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