Physics Practice: Refraction through Lenses (Mock Test 1 - Basic)
1. A lens which is thicker in the middle and thinner at the edges is called a:
2. The geometric center of a lens is known as its:
3. A convex lens is also known as a ________ lens because it brings parallel rays to a single point.
4. The S.I. unit of power of a lens is:
5. The focal length of a concave lens is always taken as:
6. A ray of light passing through the optical center of a lens suffers:
7. The distance between the optical center and the principal focus is called:
8. A real image formed by a lens is always:
9. Which lens is used as a magnifying glass?
10. The power of a lens ($P$) and its focal length ($f$) in meters are related as:
11. A virtual image formed by a convex lens occurs when the object is placed:
12. A concave lens always forms an image which is:
13. The lens formula is given by:
14. Linear magnification ($m$) for a lens is defined as the ratio of:
15. If a lens has a power of $+2.0 \text{ D}$, it is a:
16. The focal length of a lens depends on its ________ and the surrounding medium.
17. For a convex lens, if the object is at $2F$, the image is formed at:
18. A lens is part of a ________ medium bounded by two curved surfaces.
19. If the magnification is $-1$, the image is:
20. Which of the following is NOT a part of a lens?
