NEET Physics: Magnification Practice Questions
12 free multiple-choice questions on Magnification (Optics) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. A lens produces an image that is always inverted when the object is placed between the optical center and the principal focus.
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Correct answer: B — False
If the object is placed between the optical center and the principal focus of a converging lens, the image formed is virtual, erect, and magnified. The inversion depends on the exact placement relative to the focal points, but the principle is that the image type changes.
Q2. When an object is placed at twice the focal length of a convex lens, the resulting image formed is:
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Correct answer: D — Real and inverted
When an object is placed at 2F of a convex lens, the image formed is real, inverted, and magnified by a factor of 2. (This is based on the properties of lens geometry related to 2F).
Q3. What is the definition of linear magnification in optics?
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Correct answer: C — Ratio of image height to object height
Linear magnification (M) is defined as the ratio of the height of the image formed to the height of the object placed at the same distance.
Q4. An object is placed at 20 cm from a convex lens. If the image formed is virtual, what is the nature of the image according to magnification?
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Correct answer: C — Magnification is positive
When an object is placed between the optical center and the focal point of a convex lens, the image formed is virtual and erect. For a virtual image formed by a single lens, the magnification is positive (erect).
Q5. The magnification produced by a plane mirror is always:
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Correct answer: D — Positive and equal to 1
Plane mirrors produce virtual images of the same size and orientation, resulting in a magnification of +1.
Q6. If an object is placed at the center of curvature (C) of a concave mirror, what is the nature of the image formed?
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Correct answer: A — Real and inverted
When an object is placed at the center of curvature (C) of a concave mirror, it forms a real image at C which is inverted.
Q7. When an object is placed between the optical center and the focal point of a convex lens, the image formed is:
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Correct answer: B — Virtual and erect
For a convex lens, if the object is placed between the optical center (O) and the focal point (F), the image formed is always virtual, erect, and magnified.
Q8. Angular magnification of a telescope is directly proportional to which parameter?
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Correct answer: B — Magnifying power
The angular magnification of a telescope is directly proportional to its magnifying power, which is determined by the ratio of the focal lengths of the objective lens and the eyepiece.
Q9. What is the definition of magnification in optics?
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Correct answer: D — The ratio of the image height to the object height.
Magnification (m) is defined as the ratio of the height of the image (h') to the height of the object (h): m = h'/h.
Q10. If an image is formed at twice the distance of the object, what is the linear magnification produced by the lens?
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Correct answer: A — 1/2
In magnification based on image distance, if the image distance (v) is twice the object distance (u), the magnification m = -v/u = -2 (for real images, the magnitude is 2). However, for simple magnification ratio, if the image distance is 2u, the linear size is doubled. (Assuming the standard setup where magnification relates image size to object size, m=2).
Q11. For a given object size, the size of the image formed by a lens is inversely proportional to the object distance when the image is formed at a fixed distance. This relationship is governed by which principle?
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Correct answer: B — Magnification principle
Magnification is fundamentally dependent on how the lens transforms the object's geometry relative to the image plane, which is the core concept of magnification principle.
Q12. If the object distance (u) is 15 cm and the image distance (v) is 30 cm for a lens, what is the magnitude of the image distance?
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Correct answer: A — 30 cm
The image distance (v) is given directly in the problem statement, which is 30 cm.
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