CIE iGCSE Co-Ordinated Science P3.2.3 Thin converging lens Exam Style Questions Paper 2

Question

In the diagrams, F is one principal focus of the converging lens. Which diagram shows the use of a lens as a magnifying glass?

▶️ Answer/Explanation

A magnifying glass is formed when the object is placed between the lens and its principal focus. The image formed is virtual, upright, and magnified.
✅ Answer: (A)

Question

Which ray diagram shows the formation of a virtual image?

▶️ Answer/Explanation

A virtual image is formed when the refracted rays diverge and appear to come from a point behind the lens. This is shown by dotted (dashed) lines extending backwards from the refracted rays to meet at the virtual image position. Option B correctly shows this with the image formed on the same side as the object using dotted lines. Options A, C, and D show real images (formed on the opposite side of the lens) where the rays actually converge.
✅ Answer: (B)

Question

Which statement about real and virtual images formed by a thin converging lens is correct?

A. All real images are enlarged and inverted.
B. All real images can be produced on a screen.
C. All virtual images are diminished and upright.
D. All virtual images can be produced on a screen.

▶️ Answer/Explanation

Real images are formed when light rays actually converge at a point and can be projected onto a screen (statement B correct). They can be enlarged or diminished depending on object position. Virtual images cannot be projected onto a screen and are always upright, but they can be enlarged (e.g., magnifying glass).
✅ Answer: (B)

Question

The diagram shows an object at position P in front of a thin converging lens of focal length \( f \). The lens produces a real image of the object.

The object is moved to position Q. The image produced is now virtual.

What happens to the image?

A. It changes from a diminished image to an enlarged image.
B. It changes from an enlarged image to a diminished image.
C. It remains a diminished image.
D. It remains an enlarged image.

▶️ Answer/Explanation

At position P, between \( f \) and \( 2f \), a converging lens forms a real, enlarged image.
When the object moves to position Q, inside the focal length \( f \), the lens can no longer converge the rays to a real point, so a virtual image forms instead.
A virtual image formed by a converging lens with the object inside the focal length is always magnified, so the image remains enlarged throughout.
✅ Answer: (D)

Question

The diagram shows how a thin, converging lens forms an image of an object. One principal focus of the lens is labelled F.

How is the image described?

A. enlarged, upright and real
B. enlarged, upright and virtual
C. diminished, inverted and real
D. diminished, inverted and virtual

▶️ Answer/Explanation

With the object placed close to the lens between the principal focus F and the lens itself, the rays diverge after passing through and don’t actually converge on the far side.
This means the image formed is virtual, since it can’t be projected onto a screen.
An object placed inside the focal length of a converging lens always produces an image that is enlarged and upright compared to the object.
✅ Answer: (B)

CIE iGCSE Co-Ordinated Science P3.2.3 Thin converging lens Exam Style Questions Paper 2

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