An object is placed 9.00 cm from a concave (converging) mirror. Anobserver uses

Question

An object is placed 9.00 cm from a concave (converging) mirror. Anobserver uses the method of parallax to determine that the image islocated 18.9 cm behind the mirror.

(a) Calculate the focal length of the mirror.
cm

(b) This image is
real.virtual.inverted.upright.smallerthan the object.largerthan the object.thesame size as the object.
real.virtual.inverted.upright.smallerthan the object.largerthan the object.thesame size as the object.
real.virtual.inverted.upright.smallerthan the object.largerthan the object.thesame size as the object.

Explanation / Answer

Given object distance P = 9 cm    image distance   Q = - 18.9 cm        spherical mirror equation         1 / P + 1 /Q = 1 /f          1 / 9 + 1 / ( -18.9 ) = 1 / f      focal length of the mirror f = 17. 1 cm    b ) image is virtual   since    imagedistance is negative

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