Optics Question 65
Question: Assertion : The cloud in sky generally appear to be whitish. Reason : Diffraction due to clouds is efficient in equal measure at all wavelengths.
[AIIMS 2005]
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: C
Solution:
The clouds consists of dust particles and water droplets. Their size is very large as compared to the wavelength of the incident light from the sun.
So there is very little scattering of light.
Hence the light which we receive through the clouds has all the colours of light.
As a result of this, we receive almost white light.
Therefore, the cloud are generally white.
