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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
Select the correct statement about rainbow.
  • A
    We can see a rainbow in the western sky in the late afternoon
  • ✓
    The double rainbow has red on the inside and violet on the outside
  • C
    A rainbow has an arc shape, since the earth is round
  • D
    A rainbow on the moon is violet on the inside and red on the outside
✓

Answer

Correct option: B.
The double rainbow has red on the inside and violet on the outside
b
(b)

In late afternoon rainbow is visible in east side when light of sun in west side is reflected and refracted by a layer of water droplets.

Rainbow is circular because locous of reflected rays reaching eye of observer is a circle. Its roundness is not due to roundness of earth.

There is no rainbow on moon due to lack of atmosphere.

In case of a primary rainbow, violet colour is on inside and red colour is on outside of arc.

In case of a secondary rainbow, red colour is on inside and violet colour is on outside of arc.

So, none of the option is correct. Option $(b)$ is correct, if only secondary rainbow is considered.

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