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A convex lens is put 10 cm from a light source and it makes a sharp image on a screen, kept 10 cm from the lens. Now a glass block (refractive index 1.5) of 1.5 cm thickness is placed in contact with the light source. To get the sharp image again, the screen is shifted by a distance d. Then d is :

1. 0.55 cm towards the lens
2. 0
3. 0.55 cm away from the lens
4. 1.1 cm away from the lens

Correct answer: 0.55 cm away from the lens

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