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WAEC Physics 2021 Theory — Question 20

Question 20 of 35 from the West African Examinations Council (WAEC) Physics 2021 Theory paper, with the correct answer and a full explanation.

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10(a)(ii). Draw a ray diagram to illustrate how a converging lens is used to produce a virtual image of an object.

Model answer

With the object placed between the optical centre and the principal focus of a converging lens, two rays (one through the optical centre undeviated, one parallel to the axis then refracted through the far focus) are drawn; on extending the emerging rays backward, they appear to meet on the same side as the object — forming a magnified, upright, virtual image.

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