NEET Physics: Optics Practice Questions
13 free multiple-choice questions on 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 Optics 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. The magnification achieved by an astronomical telescope is primarily determined by the combination of which two elements?
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Correct answer: C — The focal length of the objective and the focal length of the eyepiece
The magnification of a telescope is the product of the magnification provided by the objective lens and the magnification provided by the eyepiece.
Q3. What is the phenomenon responsible for the deviation of light when it passes through a prism?
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Correct answer: C — Refraction
Refraction is the bending of light as it passes from one medium to another, which causes the deviation of light passing through a prism.
Q4. If an object is placed between two thin convex lenses placed in contact, where will the final image be formed?
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Correct answer: C — On the opposite side of the object
When two converging lenses are placed in contact, the combination acts as a single converging lens with a greater focal length. Objects placed between the lenses will form a real image on the side opposite to the object.
Q5. Which type of lens is primarily used in astronomical telescopes to gather light from distant objects?
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Correct answer: B — Convex Lens
Convex lenses are used in telescopes as objective lenses because they are capable of converging light rays entering the instrument and forming an image on the eyepiece plane.
Q6. What is the nature of the image formed by a plane mirror?
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Correct answer: C — Virtual
A plane mirror always forms a virtual image behind the mirror.
Q7. Which type of lens is used in a compound microscope to produce a magnified image of a specimen?
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Correct answer: C — Convex lens
Convex lenses are used in the objective and eyepiece of a microscope because they are converging lenses capable of forming magnified images of objects.
Q8. 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).
Q9. The focal length of a concave lens is always:
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Correct answer: B — Negative
Concave lenses are diverging lenses, and by sign convention, their focal length is negative.
Q10. In the context of a simple microscope, what kind of image is typically formed when viewing a specimen using the eyepiece?
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Correct answer: A — Virtual and magnified
Simple microscopes, when used for viewing objects, rely on the properties of the lens system to produce a virtual, magnified image.
Q11. What is the SI unit of the power of a lens?
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Correct answer: D — Diopter
The power of a lens is defined as the reciprocal of the focal length, and its SI unit is the Diopter (D).
Q12. The angular magnification of a telescope is primarily determined by the ratio of the focal lengths of the objective lens and the eyepiece. This relates to which principle?
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Correct answer: B — Refraction
The angular magnification in a telescope is based on the geometric relationship involving the objective lens and the eyepiece, which are both lens systems operating on refraction principles.
Q13. The angle subtended by the prism is known as:
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Correct answer: D — Angle of prism
The angle of prism (A) is the angle between the two refracting surfaces of the prism.
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