A shaving mirror is 20 cm from the face of a person. If the focal length of a shaving mirror is 80 cm then find the distance of image from the mirror and magnification of mirror.
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Answer: Given,
shaving mirror-convex mirror
u = -20cm
f= 80cm
1/v + 1/u = 1/f
v=uf/u-f
v= (-20 x 80)/(-20 - 80)
v = 16 cm
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