Answers

2016-03-07T15:29:05+05:30
Given that, focal length, f= 20 cm
                  object distance, u= -30 cm
             
                  Now, 1/f= 1/v-1/u
                  1/20= 1/v-1/(-30)
                  1/v= 1/20-1/30
                  1/v= 1/60
                  v= 60 cm
So the image will be real and on the opposite side as the object. 

Image height, v/u=I/O
                       60/(-30) = I/5
                       I= -10 cm

The negative sign indicates that the image will be inverted.





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2016-03-07T17:31:12+05:30
Given that, focal length, f= 20 cm
                  object distance, u= -30 cm
             
                  Now, 1/f= 1/v-1/u
                  1/20= 1/v-1/(-30)
                  1/v= 1/20-1/30
                  1/v= 1/60
                  v= 60 cm
So the image will be real and on the opposite side as the object. 

Image height, v/u=I/O
                       60/(-30) = I/5
                       I= -10 cm

The negative sign indicates that the image will be inverted.
0