Was Emergency Necessary

Describe the properties of colloids with necessary diagrams wherever necessary.

Copy the diagram given below and complete the path of the light ray till it emerges out of the prism. The critical angle of glass is 42^(@) . In your diagram mark the angles wherever necessary.

What is used as emergency contraceptive ?

Which of the following is used as an emergency contraceptive ?

What is necessary for work to be done? Choose the correct statement. (1) Action of force is necessary. (2) Displacement is necessary. (3) Displacement in the direction of force is necessary.

What is emergence angle?