Question

What is contraception ? List three reasons for adopting contraceptive methods?

Answer 1

Critical Angle. Because n 1 is greater than n 2, there is a certain angle i for which the angle of refraction is 90 °. From the table this special incidence angle, called critical angle, is equal to 65.39 °. Any ray incident at an angle greater than the critical angle will be totally reflected.

Answer 2

Reasons for adopting contraceptive methods?

1. To avoid unwanted Births.
2. To keep the population under control.
3. To regulate proper time gap between pregnancies.
4. To provide proper nutrition to the member of the family.