Question 15
Original source text (the exact panel preserves diagram labels, tables and choices):
Several common optical phenomena are listed below:
i. A rainbow after rain
ii. A straw appearing bent in a glass of water
iii. The bottom of a clear lake appearing shallower than it really is.
iv. The Sun appearing slightly above the horizon when it has already set
Which statement BEST describes the role of refraction in these cases?
A. Refraction is the only mechanism in all four phenomena.
B. Refraction is irrelevant for (i), but explains (ii), (iii), and (iv).
C. Refraction is important only for (i) and (ii), while (iii) and (iv) are caused by
reflection and scattering.
D. Refraction alone explains (ii), (iii), and (iv), but (i) requires both refraction and
internal reflection.
Several common optical phenomena are listed below:
i. A rainbow after rain
ii. A straw appearing bent in a glass of water
iii. The bottom of a clear lake appearing shallower than it really is.
iv. The Sun appearing slightly above the horizon when it has already set
Which statement BEST describes the role of refraction in these cases?
A. Refraction is the only mechanism in all four phenomena.
B. Refraction is irrelevant for (i), but explains (ii), (iii), and (iv).
C. Refraction is important only for (i) and (ii), while (iii) and (iv) are caused by
reflection and scattering.
D. Refraction alone explains (ii), (iii), and (iv), but (i) requires both refraction and
internal reflection.