Question

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

Answer 1

Answer:

Step-by-step explanation:

U=fxv/f+v

f,focal length

u,object distance

v,image distance

Note

Since its a concave lens , f is negative

Magnification =-v/u

Answer 2

Answer:

concave lens

f=-15cm

v=-10cm

lens formula

1/f=1/v-1/u

1/-15=1/-10-1/u

1/u=1/-10-1/-15

1/u=1/-10+1/15

denominator same

1/u =-3+2/15

1/u=-1/15

u=-15

distance between object to lens is -15

magnification

=v/u

=-10/-15

2/3

magnification =2/3