Question

A lens of focal length 12 cm magnifies
by three typesand produced an erect image.
. Then the distance between
object and lens​

Answer 1

Answer:

Relation for image size

image size = Focal Length X Object size  /  Lens-to-object distance

 

form the prob  focal length =12 cm

  object size  = m

  image size = 3m

  form the above formula  

  Lens-to-object distance=  Focal Length X Object size/ Image Size

  = 12 X m /3m= 4 cm

  

but

distance between object to image = distance  object to lense

  + distance lense to image

distance between object and lense is nothing but the focal length of the lense that is 12 cm

 so, distance between object to image = 12 + 4 = 16 cm

so option B.)16 is correct answer

hope it is useful