A) Its frequency decreases because its speed decreases
B) Its frequency increases because its speed increases.
C) Its wavelength decreases because its speed decreases
D) Its wavelength increases because its speed increases
Correct Answer: D
Solution :
[d] \[R{{l}_{air}}<R{{l}_{glass,}}\] so \[{{v}_{air}}>{{v}_{glas}}\] and hence\[{{\lambda }_{air}}>{{\lambda }_{glass}}\].
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