Question

Assertion (A) -Sunlight reaches us without dispersion in the form of white

light and not as its components.

Reason (R) : Dispersion takes place due to variation of refractive index for

different wavelength . But in vacuum the speed of light is independent of

wavelength and hence vacuum is a non-dispersive medium.​

Answer 1

Answer:

both a and b are true.and r is the correct explanation of a

Answer 2

Answer:

For assertion

• Dispersion only occurs after the sunlight enters the atmosphere at a slow rate
• So sunlight reaches us without dispersion  in the form of white light and not as its components.
• Therefore , the assertion is true.

Reasoning

• This happens as before entering the atmosphere, the sunlight passes the vacuum.
• In vacuum the light does'nt disperse
• Here , all colors travel with the same speed.

Answer

• Thus, assertion is true'
• Reasoning is also true.
• The reason is the correct explanation of the assertion.

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