Question
The human brain can be broadly divided into three regions. Name these three regions.
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| Column A | Column B |
| (1) Magnification | (a) $\frac{1}{f}$ |
| (2) Power of a lens | (b) $\frac{h_2}{h_1}$ |
| (3) Focal length | (c) $f$ |
| (4) Distance of an object from a lens | (d) $u$ |
| (e) $\frac{h_1}{h_2}$ |

(a) Identify the machine shown in the figure.
(b) Write a use of this machine.
(c) How transformation of energy takes place in this machine. (Practice Activity Sheet – 3)