A student is using a convex lens of focal length 18 cm to study the image formation by it for the various positions of the object. He observes that when he places the object at 27 cm, the location of the image is at 54 cm on the other side of the lens. Identify from the following diagram the three rays that obeying the laws of refraction and may be used to draw the corresponding ray diagram

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1, 3 and 5

1, 2, and 4

2, 3 and 4

2, 4 and 5

answer is D.

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Detailed Solution

2^{nd}

ray passing parallel to the principle axis of the refraction passes through focus.

3^{rd}

ray passing through optical centre after refraction it is un deviated.

4^{th}

ray passing near to focus after refraction it is deviate towards the focus.

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