Which of the following statements is correct?
- ADuring hot summer days,the trees and other tall objects seem to be quivering because the density of air changes in an irregular way.
- BWhen the moon is near the horizon,it appears bigger. This is due to an optical illusion.
- CIf the critical angle for the medium of a prism is $\theta_c$ and the angle of prism is $A$,there will be no emergent ray when $A > 2 \theta_c$.
- DAll of these.
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