Question

pls see my attached file and answer appropriately
l need them correctly plss​

Answer 1

v=45 cm

focal length=11.25 cm

and further parts are in the image

Answer 2

1) u=-15

m=-3(as the image formed is real)

m=v/u

-3=v/-15

v=45

1/f=1/v-1/u

1/f=1/45-1/-15

1/f=1/45+1/15

1/f=1+3/45=4/45

f=45/4

2)a convex lens converges the light rays of parallel beam to a particular point after refraction through the lens hence it id converging

a concave lens diverges the light rays of parallel beam after refraction through it hence a concave lens is called diverging