focal length of the lens , physics homework help

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Please help me finish these 7 questions about physic. Thank you very much !

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1 Suppose your lens has a focal length of 20 cm. At which of the following distances could you place the candle if you followed the instruction of the lab? Choose all which apply. 5 cm in front of the lens 10 cm in front of the lens 25 cm in front of the lens 50 cm in front of the lens 1m in front of the lens none of the above all of the above 2You focus sunlight on a piece of paper and find that the spot is 1 cm in diameter if the paper is placed 20 cm from the lens, and again if the paper is placed 30 cm from the lens. What is the focal length of the lens in cm? The focal length of the lens is ____ cm. 3 You focus sunlight on a piece of paper and find that the light seems to be most nearly focused between 24 and 25 cm from the lens. What is the uncertainty in the focal length of the lens, in cm? The focal length of the lens has an uncertainty of _____ cm. 4 Which of the following can you best use to obtain the focal length of the lens, assuming that you have made a plot of the reciprocals of the image and object positions? slope x-intercept y-intercept a single data point a random point on the line of best fit none of the above 5 6 7 What happens to the image if you place the candle closer to the lens than its focal length so that do
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Surname 1
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Supervisor
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1 Suppose your lens has a focal length of 20 cm. At which of the following distances
could you place the candle if you followed the instruction of the lab? Choose
all which apply.
10 cm in front of the
lens
25 cm in front of the
lens
50 cm in front of the
lens
1 m in front of the lens
none of the above
all of the above

Surname 2

2. You f...


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