An object placed at a distance of 3 cm from a concave lens of focal length 12 cm. Find the (i) position and (ii) nature of the image formed.
u=-3cm
f=-12cm
v=??
by lens formula 1/f=1/v - 1/u
1/-12=1/v -1/-3
1/-12=1/v +1/3
1/v=1/-3 -1/12
1/v= -5/12 or v= -12/5 or v= -2.4cm and nature = ve
f=-12cm
v=??
by lens formula 1/f=1/v - 1/u
1/-12=1/v -1/-3
1/-12=1/v +1/3
1/v=1/-3 -1/12
1/v= -5/12 or v= -12/5 or v= -2.4cm and nature = ve