Types of Rays

Q. According to Huygens principle, a wave front can propagate -

1. only in forward direction.
2. only in backward direction.
3. both forward and backward directions.
4. None of these

Q. According to Huygens principle, a wave front can propagate -

1. None of these
2. only in backward direction.
3. both forward and backward directions.
4. only in forward direction.

Q.

How do you add two waves together?

Q. According to Huygens principle, a wave front can propagate -

1. None of these
2. both forward and backward directions.
3. only in backward direction.
4. only in forward direction.

Q. According to Huygens principle, a wave front can propagate -

1. both forward and backward directions.
2. only in forward direction.
3. None of these
4. only in backward direction.