From the understanding of cartesian sign convention for reflection by spherical mirror, students took part in group discussion for FA - 1 in classroom. Who is wrong in the group discussion?
Alpesh : All the distances are measured from the pole of a mirror parallel to the principal axis.
Beena : The distances measured in the direction of incident ray are taken positive.
Chamak : The height measured upward and perpendicular to principal axis is taken negative.
Daksha : The height measured downward and perpendicular to principal axis is taken as positive.

Champak and Daksha

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Only Champak

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Alpesh and Beena

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Only Daksha

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Solution

The correct option is B Champak and Daksha
1- It is true that all the distances are measured from the pole of a mirror parallel to the principal axis.So, Alpesh is right.
2-It is also true that the distances measured in the direction of incident ray are taken positive.So, Beena is also right
3-The height measured upward and perpendicular to principal axis is taken positive. So, Chamak is wrong.
4-The height measured downward and perpendicular to principal axis is taken as negative.So, Daksha is also wrong.
So, only Champak and Daksha are wrong.
Therefore, A is correct option.

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