Physics

Problem

A concave lens has a focal length of

-20\,\text{cm}

. An object is placed 30 cm in front of the lens. Determine the image distance

s_i

. a)

+60\,\text{cm}

(image opposite the object) b)

-12\,\text{cm}

(image on the same side as the object) c)

-60\,\text{cm}

(image on the same side as the object) d)

+12\,\text{cm}

(image opposite the object)