Question

An object is placed of 60cm from a concave lens of focal length 30cm.
Use lens formula to find the distant of the image from the lens

Answer 1

(1÷v) - (1÷u) = 1÷f

v = 60 cm

f = 30 cm

(1÷60) - (1÷u) = 1÷30

(1÷60) -(1÷30) = 1÷ u

3÷60 = 1÷ u

1÷20 = 1÷u

u = 20cm

image form will be at 20 cm