Refer the materials and procedure given on textbook page no. 52. Record your observations in the chart. :
Repeat this procedure with each of the given materials.

Refer the apparatus and procedure given on textbook page no. 53. Rcord your observations in each of the above procedures in the chart.

Assign names in the figure given on textbook page no. 88. Explain the various stages those are kept blank.

Observe the figures given below and write the type of each of the angles :

Observe the figures given below and write the type of each of the angles :

Observe the figures given below and write the type of each of the angles :

To charge an object by induction. : Rub a comb or a balloon on your hair. As shown in the picture 8.4 on page 54 of your textbook, take the comb near a thin trickle of water from a tap what happes. Now draw the comb away from the trcikle and observe what happens. : Mark your observation with a tick. : When the charged comb is brought close to the flowing water, water gets attracted/repelled/remains as it was. : when the charged comb is taken away from the flowing water, it gets attracted.repelled/remains as it was initially.

The refractivity of the material of the prism is given by