A bag contains 5 red, 5 white and 8 blue bells what is the probability that two balls are drawn are white and blue
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probability of white ball=5/18
probability of blue ball=8/18=4/9
probability of blue ball=8/18=4/9
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to draw those ray diagram you just have to follow the three rules:-
rule 1. if an incident ray is parallel to the principal axis then after reflection the reflected ray passes through the focus
rule 2. if the incident ray passes through the focus then after reflection the reflected ray is parallel to the principal axis
rule 3. if the incident ray passes through the centre of curvature then after reflection the reflected ray traces the same path back
if you remember all this three rule than you can draw any type of diagram
rule 1. if an incident ray is parallel to the principal axis then after reflection the reflected ray passes through the focus
rule 2. if the incident ray passes through the focus then after reflection the reflected ray is parallel to the principal axis
rule 3. if the incident ray passes through the centre of curvature then after reflection the reflected ray traces the same path back
if you remember all this three rule than you can draw any type of diagram
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