Ray Optics and Optical Instruments - Result Question 23

23. Time taken by sunlight to pass through a window of thickness 4mm whose refractive index is 32 is

(a) 2×104sec

(b) 2×108sec

(c) 2×1011sec

(d) 2×1011sec

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Answer:

Correct Answer: 23. (c)

Solution:

  1. (c) vg=cμ=3×10832=2×108m/s

t=xvg=4×1032×108=2×1011s



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