Physics Practice: Refraction through Lenses (Mock Test 2 - Intermediate)
1. The point on the principal axis where a beam of light parallel to the principal axis actually converges after refraction through a convex lens is called:
2. A lens has a focal length of $-20 \text{ cm}$. The nature of the lens and its power are:
3. Where should an object be placed in front of a convex lens so that the image is formed at infinity?
4. The thickest part of a concave lens is at the:
5. A convex lens forms a real, inverted and highly diminished image at the focus. The object is at:
6. If an object is placed at a distance of $10 \text{ cm}$ from a convex lens of focal length $20 \text{ cm}$, the image is:
7. The power of a combination of two lenses of power $+4 \text{ D}$ and $-2 \text{ D}$ kept in contact is:
8. Linear magnification ($m$) is negative for ________ images and positive for ________ images.
9. A ray incident on a concave lens parallel to the principal axis, after refraction, appears to come from:
10. For a lens, the sign of 'u' (object distance) according to the Cartesian sign convention is always:
11. A convex lens acts as a simple microscope when the object is placed:
12. The focal length of a lens is $50 \text{ cm}$. Its power is:
13. In a concave lens, the image is always formed between:
14. If magnification $m = +3$, the image is:
15. The focal length of a lens ________ when it is immersed in water.
16. Which of the following is a correct rule for ray diagrams?
17. A lens of shorter focal length has ________ power.
18. To get a real image of the same size as the object with a convex lens, the object distance should be:
19. The plane passing through the focus and perpendicular to the principal axis is the:
20. In the lens formula $1/v - 1/u = 1/f$, if the lens is concave, both $f$ and $v$ (for a real object) are:
