Q10 of 22 Page 157

Choose the correct option by making hypothesis is based on given assertion and reason. Give an explanation

Assertion (A): Blue colour of sky appears due to scattering of light.


Reason (R): Blue colour has shortest wavelength among all colours of white light.


A. Both A and R are true and R is the correct explanation of A.


B. Both A and R are true and R is not the correct explanation of A.


C. A is true but R is false.


D. Both A and R are false.


E. A is false but R is true.

Assertion (A) is correct because the sky appears blue due to scattering of light. Our atmosphere is comprised of oxygen and nitrogen molecules. So the wavelength of blue & violet is comparable to these molecules. Therefore the molecules present in air scatter the blue & violet light.

Reason (R) is false as violet has the shortest wavelength among all the colours of white light. So, in the prism experiment it is deviated the most. As human eye is more sensitive to blue light than violet, therefore the shy appears blue to us.


So, A is true & R is false.


More from this chapter

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8

Light of wavelength enters a medium with refractive index n2 from a medium with refractive index n1. What is the wavelength of light in second medium?

 9

Choose the correct option by making hypothesis is based on given assertion and reason. Give an explanation

Assertion (A): The refractive index of a prism depends only on the kind of glass of which it is made of and the colour of light.


Reason (R): The refractive index of a prism depends on the refracting angle of the prism and the angle of the minimum deviation.


A. Both A and R are true and R is the correct explanation of A.


B. Both A and R are true and R is not the correct explanation of A.


C. A is true but R is false.


D. Both A and R are false.


E. A is false but R is true.

 11

Suggest an experiment to produce a rainbow in your classroom and explain the procedure.

 12

Prisms are used in binoculars. Collect information why prisms are used in binoculars.