The following data was recorded for values of object distance and the corresponding values of image distance in the experiment on study of real image formation by a convex lens of power +5 D, One of these observations is incorrect. Identify this observation and give reason for your choice :
| S. No. | 1 | 2 | 3 | 4 | 5 | 6 |
| Object distance (in cm) | 25 | 30 | 35 | 45 | 50 | 55 |
| Image distance (in cm) | 97 | 61 | 37 | 35 | 32 | 30 |
Dear student
given power = 5
we have the formula P=1/f
1/f=p=5/100cm =.05 cm-1
(we divide P by100 to change the unit to cm )
Also we have 1/f=1/u+1/v
now by putting all values of u and v and calculate 1/f=.05
All the values of u and v gives 1/f=.05 except sr.no. 3 . It gives value 6
hence it is incorrect.
given power = 5
we have the formula P=1/f
1/f=p=5/100cm =.05 cm-1
(we divide P by100 to change the unit to cm )
Also we have 1/f=1/u+1/v
now by putting all values of u and v and calculate 1/f=.05
All the values of u and v gives 1/f=.05 except sr.no. 3 . It gives value 6
hence it is incorrect.
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