The image is virtual, 3cm in front of the lens
The image is real, 6cm behind the lens
The image is virtual, 6cm in front of the lens
The image is real, 3cm in front the lens
Correct answer is A
F = \(\frac{uv}{u + v}\)
F = -ve
-12 = \(\frac{4 \times v}{4 + v}\)
v = -3cm