Which of the following statements best describes the optical element hidden hidd

Question

Which of the following statements best describes the optical element hidden 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 concur 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 wavelengths of light is not visible to the average human eye? A) 475 nm B) 533 ran C) 644 ran D) 700 nm E) 810 nm Which type of wave is an electromagnetic wave? A) transverse B) sound C) longitudinal D) None of these. For a particular mirror with an object in front of it, the image distance is positive and half the object distance (positive) in magnitude. What can be said of the image? A) It is real, upright and smaller than the object. B) It is virtual, upright and smaller than the object. C) It is real, inverted and smaller than the object. D) It is virtual, inverted and bigger than the object. E) It is real, upright and bigger than the object. Which of the rays labeled in the diagram to the right would likely correspond to visible light that is red?

Explanation / Answer

3.1 Option (C).

3.2, Only visible spectrum is visible to human eye. white light and its 7 components fall under visible spectrum which ranges from 400 nm to 700 nm. Therefore, correct option is 810 nm which is beyond the visible range.

3.3 option (d). None of these. sound wave is a mechanical wave and cant travel in vacuum.

3.4 As virtual images are always upright and negative image distance means virtual image, correct option is (B).

3.5, according to VIBGYOR,which starts from lower dispersed ray, correct option is (A).

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