| An object is located in a fixed position in front of a screen. |
| Sharp image is obtained on the screen for two positions of a thin lens separated by 10 cm. The size of the images in two situations are in the ratio 3 : 3. What is the distance between the screen and the object? [JEE ONLINE 11-04-2014] |
A) 124.5 cm
B) 144.5 cm
C) 65.0 cm
D) 99.0 cm
Correct Answer: D
Solution :
| [d] Given: Separation of lens for two of its position, d = 10 cm |
| Ratio of size of the images in two positions |
 |
| Distance of object from the screen, D = ? |
Applying formula,  |
   |
 |
 |
| On solving, we get D = 99 cm |
| Hence the distance between the screen and the object is 99 cm. |
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