Fully explained correct answers = thumbs up for you! Thank you very much :) 1) I
ID: 1492741 • Letter: F
Question
Fully explained correct answers = thumbs up for you! Thank you very much :)
1) In her job as a dental hygienist, Kathryn uses a concave mirror to see the back of her patient's teeth. When the mirror is 1.00 cm from a tooth, the image is upright and 2.91 times as large as the tooth. What are the focal length and radius of curvature of the mirror?
f = ____ cm
R = _____ cm
2) An object is placed in front of a convex mirror with a 27.8 cm radius of curvature. A virtual image half the size of the object is formed. At what distance is the object from the mirror?____ cm infront/behind the mirror
Explanation / Answer
for concave mirror the focal length is positive
using 1/f = 1/do + 1/di
1/f = (1/1)+(1/di)
magnification m = -di/do = hi/ho = 2.91
di = -2.91*do = -2.91
1/f = (1/1)-(1/2.91)
focal length is f = 1.523 cm
radisu of curvature is R = 2*f= 2*1.523 = 3.046 cm
2) f = -R/2 = -27.8/2 =-13.9 cm
and hi/ho = 1/2
hi = ho/2
magnification m = -di/do = 1/2
di = -0.5*do
then using
1/f = 1/do + 1/di
(-1/13.9) = (1/do) -(1/0.5do)
do = object distance is 13.9 infront of the mirror
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.