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Home Q & A Board Science-Related Homework Help Physics
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tankster tankster
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7 years ago
John's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and erect, what is the focal length of the mirror?
A) 10 cm
B) 20 cm
C) 30 cm
D) 40 cm
E) 50 cm
Textbook 
Physics

Physics


Edition: 4th
Author:
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mtown88mtown88
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7 years ago
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tankster Author
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7 years ago
Thank you, thank you, thank you!
SUmmerPeople
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Yesterday
This helped my grade so much Perfect
mikeh209
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2 hours ago
Good timing, thanks!
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