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 concave mirror. 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

FIRST PART
Step - I

From the given diagram one thing is clear that in hidden box is not a mirror. Becouse the light is refracted. If it has mirror than it should be reflected....but we can clearly see that light is passes through the Box it means it must be Either concave lens or convex lens.

Step -II If the light passes through the lens bend towrds its normal than that lens would be convex lens and if light bends away from its normal than that lens would be concave lens.

Here in the given diagram we can clearly see that light bends towards its normal hence given Black Box has CONVEX lens. So option B is correct.

SECON PART

From the Electromagnetic Spectrum, Radio waves has smsllest frequncy. I.e f = 10^9 to 5x 10^5 Hz.

hence option D is the the answer.

Hope you will get it.

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