Question

A convex lens with focal length 15cm is placed 45cm away from the object 2.5 cm tall.

a - Determine the position and the size of the image

b- If the convex lens were a concave lens, what is the value of the magnitude of the image and the image distance

Answer 1

1/v+1/u= 1/f

Answer 2

1/f=1/p+1/q p=object distance q=image distance convert all distances in meter then calculate it

Answer 3

thanks @demitris