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  1. M

    is it dangerous to eat the lead in the pencil?

    i just noticed that my little brother eats the lead of the pencil.is it dangerous or poisonous.
  2. M

    physics help needed....!11?

    A ray of light strikes a plane mirror so that the reflected ray makes 20 degrees with the incident ray. the mirror is now turned 15 degrees. what are the incident and Reflection angle??
  3. M

    physics help......best answer will be awarded 10points?

    A concave mirror and a convex mirror of same focal lenght are mounted co-axially with their reflecting faces facing each other, separated by 60 cm distances. A point is placed midway between two mirrors. If the reflection takes place at concave mirror and then at convex mirror , find the...
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