Draw a ray diagram to show the formation of a rainbow in the sky. On this diagram mark A – where dispersion of light occurs, B – where internal reflection of light occurs and C – where refraction of light occurs. List two necessary conditions to observe a rainbow.

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TextPower of Accommodation of EyeDispersion of White Light by PrismCBSE PYQ

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Assertion (A) : The rainbow is a natural spectrum of sunlight in the sky. Reason (R) : Rainbow is formed in the sky when the sun is overhead and water droplets are also present in air.

Assertion-ReasonDispersion of White Light by PrismSpectrum of White Light

The white light entering a glass prism, gets split into its constituent colours. It is observed that :

MCQ (Single)

Dispersion of White Light by Prism

Spectrum of White Light

The phenomena of light involved in the formation of rainbow are :

MCQ (Single)Dispersion of White Light by Prism

The colour of light for which the refractive index of glass is minimum, is :

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What is dispersion of white light ? State its cause. Draw a diagram to show dispersion of a beam of white light by a glass prism.

TextDispersion of White Light by PrismSpectrum of White Light

Define the term power of accommodation of human eye. What happens to the image distance in the eye when we increase the distance of an object from the eye ? Name and explain the role of the part of human eye responsible for it in this case.

TextStructure of Human EyeFunction of Various Parts of Human EyePower of Accommodation of Eye