Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: At the first glance, the top surface of the Morpho butterflys wing appears a beautiful blue-green. If the wind moves the colour changes. Reason: Different pigments in the wing reflect light at different angles.A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true but reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
Correct Answer: C
Solution :
The morpho butterflies are among the largest in the world, with a wingspan of 7.5 to 20 cm. The males have the beautiful metallic blue upper wings. Their iridescence is due to the microscopic structure of their wings. In these butterflies iridescence is caused by multiple slit interference. Sunlight contains a full range of light wavelengths. Interference occurs when light hitting the wing combines with light reflected off the wing. Light is a wave. If the crests and throughs of waves are aligned or "in phase" they will cause constrictive interference and iridescence.
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