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) longitudinal B) sound C) transverse 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 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 green?

Explanation / Answer

1

The correct option is – C

Explanation – as wave front is neither converging nor diverging so the element can’t be a lens or mirror. It can only be flat piece of glass.

2

The correct option is – E

Explanation – as visible spectrum rages 400 nm to 800 nm and only 810 lies out of this range

3

The correct option is – A

Explanation – as the electric and magnetic field variations are perpendicular to the direction of propagation of waves.

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