Question

5 cm high object is placed at a distance of 25 cm from a converging lens of focal length of 10cm. Determine the position,size and type of the image. Solve the following example

Answer 1

Answer:

given data

              ho = 5 cm          do = 25 cm        f = 10 cm        di = ?      hi = ?  

type of image = ?

                          1/f  = 1/ di   + 1/d0

                         1/f - 1/do = 1/di = 1/10 - 1/25 = 0.1 - 0.04 =0.06 cm

                          di = 1/0.06= 16.6 cm

           for         hi

                                       M = - di/ do = - 16.6cm / 25 cm= - 0.664

            also

                                  M = hi/ho  

                                   - 0.664 * ho = hi = - 0.664 * 5 cm = - 3.32 cm

        the image is real and inverted , located opposite side of the lens  

Explanation: