question_answer 9)

An object of size 3'0 cm is placed 14 cm infront of a concave lens of focal length 21 cm. Describe the image produced by the lens. Whathappens if the object is moved farther from thelens ?  

Answer:

Using and sign convention we get                 or Also, the magnification, the image is virtual, erect, diminished andis formed on the same side of the lens at adistance of 8-4 cm from the lens. If the objectis moved away from the lens, the imagemoves towards the principal focus and goeson decreasing in size.