Question

Assertion : A rainbow is a natural spectrum appearing in the sky after a rain shower. Reason : It is caused by reflection of sunlight by tiny water droplets present in the atmosphere. *
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
(c) Assertion is true but Reason is false.
(d) Both Assertion and Reason are false

Answer 1

Both assertion and reason are true and the reason is the correct explanation of assertion.

Explanation:

• The rainbow appears in the sky after it rains.
• This is because the air in the atmosphere gets filled up with rain drops. The rain drops acts like a tiny prism.
• At this point, when the sunlight passes through the raindrops at the right angle, the light gets split into an arc of colours with red on the outside of the band and the violet colour on the inside of the band.
• As the rainbow is formed naturally by the reflection of sunlight inside the rain drops, it is called as a natural spectrum appearing in the sky.
• Thus, both assertion and reason are true and the reason given is the correct explanation of assertion.

Answer 2

Answer:

Assertion : A rainbow is a natural spectrum appearing in the sky after a rain shower.

Reason : It is caused by reflection of sunlight by tiny water droplets present in the atmosphere.

Both assertion and reason are correct and reason is the correct explanation.

Rainbow is an arc shaped natural dispersion of light seen in the sky after rain.

This is mainly due to total internal reflection of the light waves from the water droplets leading to dispersion and splitting of white sunlight into its component colours.

The sunlight enters the droplets by refraction. From the back surface , they undergo Total Internal Reflection and emerge out the droplet to form the colour spectrum.

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