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Attempt either subpart (a) or (b) :
OR
(b) When a ray of light passes from water to air (I) will the angle of refraction in air (r) be greater than the angle of incidence in water (i) or less than it ? (II) and when we increase the angle of incidence in water, will the angle of refraction in air increase or decrease ? What is the limiting value for $\angle\text{r}$ ?
OR
(b) When a ray of light passes from water to air (I) will the angle of refraction in air (r) be greater than the angle of incidence in water (i) or less than it ? (II) and when we increase the angle of incidence in water, will the angle of refraction in air increase or decrease ? What is the limiting value for $\angle\text{r}$ ?
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(b) (I) $\angle r$ will be greater than $\angle i$. (1 Mark)
(II) • $\angle r$ will increase. (½ Mark)
• Limiting value of $\angle r$ will be $90^\circ$. (½ Mark)
(II) • $\angle r$ will increase. (½ Mark)
• Limiting value of $\angle r$ will be $90^\circ$. (½ Mark)