Which of the following statements is correct?

  • A
    During hot summer days,the trees and other tall objects seem to be quivering because the density of air changes in an irregular way.
  • B
    When the moon is near the horizon,it appears bigger. This is due to an optical illusion.
  • C
    If 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 $A > 2 \theta_c$.
  • D
    All of these.

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