Question

An object 1 centimeter high is placed 4 centimeters away from a converging lens having a focal length of 3 centimeters.

(a) Sketch a principal ray diagram for this situation.

(b) Find the location of the image by a numerical calculation.

(c) Determine the size of the image.

Answer 1

(a)

(b) 1/f = 1/d_o + 1/d_i … 1/3 = 1/4 + 1/ d_i … d_i = 12 cm

(c) M = – d_i / d_o … M = –12/4 = –3 … M = h_i / h_o … –3 = h_i / 1cm … h_i = – 3cm