(8%) Problem 8: A person who is nearsighted has a far point of de 9 m. She wears

Question

(8%) Problem 8: A person who is nearsighted has a far point of de 9 m. She wears glasses that are designed to sit d 2.6 cm from her eyes Randomized variables do 49 m. d 2.6 cm. 50% Part (a) Write an expression for the focal length of the glasses which will allow her to see distant objects clearly Grade Summarv 0% Deductions Potential 100% Late Work 65% 7 8 9 Late Potential 65% Submissions Attempts remaining: 2 0% per attempt) detailed view 0% 0% 0% I give up! Submit Hint 0% Hints 1 for a 0% deduction. Hints remaining 4 Feedback 0% deduction per feedback. The object distance for the eyes will be the image distance for the glasses Submission History Feedback Answer Hints Totals 0% 0% d do do d) 0% 0% /d) 0% Note: Feedback not 0% 0% accessed 0% -The object distance for the eyes will be the image distance for the 0% 0% glasses Totals 0% 0%

Explanation / Answer

1)

do = 4.9 m

d = 0.026 m

1/f = 1/do + 1/d

f = 1/4.9 + 1/0.026

f = 2.586 cm

2)

P = mv

v = p / m

v = (0.83 x 10^-21 kg.m/s) / (9.11 x 10^-31 kg)

v = 9.11 x 10^8 m/s

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