Question
Draw three structural formulae having molecular formula $C_5H_{12}.$
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(i) ray AB
(ii) Ray BC
(iii) ray CD

| Column A | Column B |
| (1) Nearsightedness | (a) Ciliary muscles become weak |
| (2) Farsightedness | (b) Image in front of the retina |
| (3) Presbyopia | (c) Colour-blindness |
| (d) Image behind the retina |
| 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) $\frac{h_1}{h_2}$ |