Question
Can virtual image be formed on the retina in a seeing process?
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| Material | Permeability | Susceptibility | Temperature dependence of susceptibility. |
| A | Low positive | Small but negative | Independent of temperature |
| B | High | Very high 1 | Susceptibility decreases with temperature |
| C | Greater than 1 | Small but positive | Decreases with temperature |
$\text{B}_{y} = ( 8 \times 10^{-6}) sin [2\times 10 ^{11}t + 300 \pi\text{x}] T$.