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9. Ray optics abd optical instruments — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics9. Ray optics abd optical instruments1 Mark
MCQ
White light is split into a spectrum by a prism and it is seen on a screen. If we put another identical inverted prism behind it in contact, what will be seen on the screen?
  • A
    Violet will appear where red was
  • B
    The spectrum will remains same
  • C
    There will be no spectrum, but only the original light with no deviation
  • ✓
    There will be no spectrum, but the original light will be laterally displaced
✓

Answer

Correct option: D.
There will be no spectrum, but the original light will be laterally displaced
d
(d)

First prism separates white light into its constituent colours which are then recombined by the second inverted prism into white light.

As two prisms combinedly form a glass slab, light beam is deviated on a parallel path.

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