posted by Orla
An object has an angular size of 0.0140 rad when placed at the near point (20.0 cm) of an eye. When the eye views this object using a magnifying glass, the largest possible angular size of the image is 0.0490 rad. What is the focal length of the magnifying glass?
Don't be at that craic now Orla, you just need to Trappe yourself in the library a bit more often