Assertion: At the first glance,the top surfac | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The Assertion is correct. The colour of the Morpho butterfly's wing is not due to pigments,but due to structural colouration caused by the interfe

Vedclass · Accepted Answer

If the Assertion is correct but Reason is incorrect.

Vedclass · Answer

(C) The Assertion is correct. The colour of the Morpho butterfly's wing is not due to pigments,but due to structural colouration caused by the interference of light reflected from the microscopic scales on the wing surface.When the wind moves the wing,the angle of incidence and the path difference between the light waves reflected from different layers of the scales change. This causes a shift in the interference pattern,resulting in a change in the observed colour.The Reason is incorrect because the colour is not caused by pigments,but by the physical structure of the wing surface (thin-film interference).Therefore,the correct option is $(C)$.

Assertion: At the first glance,the top surface of the Morpho butterfly's wing appears a beautiful blue-green. If the wind moves the colour changes.
Reason: Different pigments in the wing reflect light at different angles.

Similar Questions

$A$ parallel coherent beam of light falls on a Fresnel biprism of refractive index $\mu$ and refracting angle $\alpha$. The fringe width on a screen at a distance $D$ from the biprism will be (wavelength $= \lambda$).

$A$ Fresnel's biprism experiment is performed in water. If the fringe width in air is $\beta_a$,and the refractive indices of the biprism material and water are $1.5$ and $1.33$ respectively,find the new fringe width.

In a Fresnel biprism experiment,the two positions of the lens give separations between the virtual slits as $16 \; cm$ and $9 \; cm$ respectively. What is the actual distance of separation (in $cm$)?

In a biprism experiment,$21$ fringes are observed in a given region using light of wavelength $4800 \text{ Å}$. If light of wavelength $5600 \text{ Å}$ is used,the number of fringes in the same region will be:

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Assertion: At the first glance,the top surface of the Morpho butterfly's wing appears a beautiful blue-green. If the wind moves the colour changes.Reason: Different pigments in the wing reflect light at different angles.