Question

You have a concave spherical mirror with a 1 0.7-cm radius of curvature. You place an object on the mirror?s axis, 18.9 cm in front of the mirror. How far is the object?s image from the mirror? Number cm If it can be determined, is the image real or virtual? Real Virtual Cannot be determined If it can be determined, is the image upright or inverted with respect to the object? Upright Inverted Cannot be determined

Answer 1

since lens is concave so it will have negative focal length

f=R/2

R=10.7cm=0.107m

so f=0.107/2

f=-0.054m

magnification, m = f / (f-u)

=-0.054/(-0.054-0.189)

m=0.22

since m is positive so image will be virtual image--answer for b

u = f - f /m

=-0.054-(-0.054/0.22)

=0.192m

=19.2cm--answer to a

c)A concave lens always shows a smaller upright virtual image