1. Calculate Refractive Index ($\mu$):
$\mu = \frac{c}{v} = \frac{3 \times 10^8}{2 \times 10^8} = 1.5$.

2. Determine Radius of Curvature ($R$):
For a lens with radius of aperture $r = 3 \text{ cm}$ and thickness $t = 0.3 \text{ cm}$, the radius of curvature is given by $R \approx \frac{r^2}{2t}$ (for small thickness).
$R = \frac{3^2}{2 \times 0.3} = \frac{9}{0.6} = 15 \text{ cm}$.

3. Lens Maker's Formula:
$\frac{1}{f} = (\mu - 1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right)$. For a plano-convex lens, $R_1 = R$ and $R_2 = \infty$.
$\frac{1}{f} = (1.5 - 1) \left( \frac{1}{15} \right) = 0.5 \times \frac{1}{15} = \frac{1}{30}$.
Thus, $f = 30 \text{ cm}$.

1. Breathe normally
2. Eat and drink adequately
3. Eliminate body wastes
4. Move and maintain posture
5. Sleep and rest
6. Select suitable clothes
7. Maintain body temperature
8. Keep body clean and protect integument
9. Avoid environmental dangers
10. Communicate with others
11. Worship according to one's faith
12. Work and sense accomplishment
13. Play and participate in recreation
14. Learn, discover, or satisfy curiosity

1. Original encounter: First impressions — both nurse and patient form perceptions of each other
2. Emerging identities: Nurse and patient begin to perceive each other as unique individuals (not stereotyped roles)
3. Empathy: Nurse shares in the patient's psychological state; understands the meaning of their experience
4. Sympathy: Nurse not only understands but wants to alleviate the patient's suffering (goes beyond empathy)
5. Rapport: The culminating phase — nurse and patient transcend roles; true human connection is achieved; characterized by compassion, trust, and mutual understanding