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A monochromatic beam of light is inci...

A monochromatic beam of light is incident at the interface of two materials of refractive index `n_1` and `n_2` as shown . If ` n_1 gt n_2` and ` theta_C` is the critical angle then which of the following statements is NOT true ?

A

`theta_1 = theta_3` for all values of ` theta_1`

B

`cos theta_2 ` is imaginary for ` theta_1 gt theta_2`

C

`cos theta _2 =0 ` for ` theta_1 = theta_C `

D

`cos theta _3` is imaginary for ` theta_1 = theta_c`

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