Question

A concave lens has focal length of 15 cm. At what distance should
the object from the lens be placed so that it forms an image at 10 cm
from the lens? Also, find the magnification produced by the lens.​

Answer 1

Explanation:

answer of this question

Answer 2

Answer

Dist of object (u) from lens= -30cm

Magnification(m)= -1/3

Explanation:

f=-15

v=-10

lens formula- 1/f=1/v-1/u

-1/15=-1/10-(-1/u)

u=-30 cm                              (i think u can do calculations)

m= -v/u

m= -(-10)/-30

m=-1/3

so the image formed is 3 times smaller than object.

hope u will understand!!!!