Question

Radiation of Violet and red colour are made fall on glass slab. Which of these will have I) minimum iI) maximum lateral displacement? and why? ​

Answer 1

Answer:

Red colour will have minimum deviation and violet will have maximum deviation.

Deviation in a glass slab depends on the refractive index, which depends on the wavelength of light used.

Red colour has a larger wavelength, so less refractive index and less deviation.

Violet has a smaller wavelength, so higher refractive index and greater deviation.

( Refractive index is indirectly proportional to wavelength)

Answer 2

As per the given question, the violet radiation will have the maximum lateral Displacement and the red radiation will have the minimum lateral Displacement.

Explanation:

• Lateral Displacement is defined as which is a perpendicular distance between the produced forward incident ray and the emergent ray from the slab of the glass.
• As we know that, the Refractive index is inversely proportional to the wavelength.
• And the Refractive index is proportional to the deviation.
• Then, the lateral Displacement which is a deviation, that depends upon the Refractive index, as per the wavelength used.
• The red radiation has more wavelength, so the refractive index is less for the red radiation. So, the lateral displacement is less.
• The violet radiation has less wavelength, so the refractive index is more for the violet radiation. So, the lateral displacement is also more.

To know more;

Which color has the highest refractive index?

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