Which of the following statements best describes the optical element hidden by t

Question

Which of the following statements best describes the optical element hidden by the black box in the diagram given the behavior of the parallel rays of light incident on it? A) The black box must contain a concave lens. B) The black box must contain a convex lens. C) The black box must contain a flat piece of glass. D) The black box must contain a convex mirror. E) The black box must contain a plane mirror. Which of the following has the smallest energy? A) gamma rays B) infrared C) microwaves D) radio waves E) ultraviolet F) visible light

Explanation / Answer

B1): ans- C its a flat piece of glass as ray is refracted and is parallel to incident ray.

B2): ans- D radio wave has lowest frequency so lowest energy.

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