Physics Practice: Refraction through Lenses (Mock Test 3 - Advanced)
1. Mechanism of Action: Why does a ray of light passing through the optical center of a thin lens remain undeviated?
2. A convex lens forms a real image of the same size as the object. If the object is now moved towards the lens, the image will:
3. The linear magnification produced by a concave lens is $0.4$. This indicates that the image is:
4. For a convex lens, as the object is brought from infinity towards the focus ($F_1$), the real image moves from:
5. Which of the following correctly describes the "Power" of a diverging lens of focal length $25 \text{ cm}$?
6. Why does a thick lens suffer from chromatic aberration while a thin lens does not (relatively)?
7. A convex lens of focal length $f$ is cut into two equal halves along the principal axis. The focal length of each half will be:
8. A point object is placed at a distance of $20 \text{ cm}$ from a convex lens of focal length $10 \text{ cm}$. If the lens is now covered with a black paper on the upper half:
9. The focal length of a convex lens is maximum for ________ light and minimum for ________ light.
10. An object is placed at $60 \text{ cm}$ from a lens. A real image is formed at $30 \text{ cm}$ on the other side. The focal length is:
11. A virtual, erect and magnified image is formed by a convex lens. The magnification ($m$) is:
12. If the radii of curvature of both surfaces of a glass lens are doubled, its focal length will:
13. A ray of light parallel to the principal axis of a convex lens, after refraction, passes through:
14. Which of the following is used by a watch repairer?
15. A lens is placed in a liquid whose refractive index is equal to that of the lens material. The lens will:
16. The image formed by a camera lens on the film is:
17. If $u$ is negative and $v$ is positive in the Cartesian system for a lens, the image is:
18. A burning glass is actually a:
19. In a slide projector, the object (slide) is placed between:
20. The power of a lens is $-2.5 \text{ D}$. Its focal length is:
