Because si = 60 cm, the object distance, so, must be 240 cm.
Therefore
- B A bi-concave lens is a diverging lens. Diverging lenses have negative focal
lengths, which eliminates (A). Both converging and diverging lenses can
magnify objects (m = −si/so). Diverging lenses only form virtual images
[eliminate (C)], which makes (B) true.