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Ray Optics and Optical Instruments — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsRay Optics and Optical Instruments1 Mark
MCQ

For a glass prism, the angle of minimum deviation will be smallest for the light of:

  • A
    Red colour.
  • B
    Blue colour.
  • C
    Yellow colour.
  • D
    Green colour.
✓

Answer

  1. Red colour.

Explanation:

When a ray of light passes through a prism, it disperses the ray of light into seven colours. They are - Violet, Indigo, Blue, Green, Yellow, Orange, Red i.e., VIBGYOR.

The angle of deviation increases in order.

It means that Violet bends the most and Red the least. The extent of bending depends on their wavelength. Red has larger wavelength than blue.

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