Q11 of 22 Page 157

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

Objective: To produce a rainbow in classroom


Materials required : prism, wooden plank, white light source,table


Procedure:


● Cover all the windows & close the doors so that the classroom becomes a dark room.


● Take the prism & place it on the table in front of the white wall.


● Take a wooden plank and make a small hole in it.


● Keep the wooden plank in between the white light & the prism so that a narrow beam of light falls on the refracting surface of the prism.


● Adjust the height of the prism so that the narrow beam of light falls on the refracting surface of prism.


● Observe the changes in the emergent rays.


● Now rotate the prism so that perfect spectrum is obtained on the wall.


Conclusion: The spectrum of light is obtained on the wall of the classroom due to dispersion of light



More from this chapter

All 22 →
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.

 10

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.

 12

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

 13

Incident ray on one of the face (AB) of a prism and emergent ray from the face AC are given are given in figure Q.13. Complete the ray & diagram.