The diagram shows a ray of light passing through a converging lens. The ray passes through point F on the left side of the lens before reaching the lens. Which path does the ray follow after passing through the lens?

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Question

The diagram shows a ray of light passing through a converging lens. The ray passes through point F on the left side of the lens before reaching the lens. Which path does the ray follow after passing through the lens?

Accepted Answer

It emerges parallel to the principal axis — Award 1 mark for recognising that a ray passing through the principal focus before the lens emerges parallel to the principal axis after refraction. This is the reverse of the ray parallel to the axis that passes through F. A is incorrect as this describes the first construction ray. C describes a different construction ray. D is incorrect because total internal reflection occurs at boundaries, not in lenses.

Answer

It is totally internally reflected

Answer

It passes through the optical centre

Answer

It passes through F on the right side of the lens

Answer

It emerges parallel to the principal axis

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