Question

16. An object is placed at 10 cms from a convex
lens of 15cms focal length. Find the position and
nature of the image.
​

Answer 1

u = -10cm

f = 15cm

so,

lens formula

1/f = 1/v - 1/u

1/15 = 1/v - 1/-10

1/15 = 1/v + 1/10

1/15 - 1/10 = 1/v

2 + 3 /30 = 1/v

5/30 = 1/v

1/6 = 1/v

v = 6cm

m = -v/u = -6/-10 = 6/10 = 3/5 = 0.6cm