KVPY SA Exam 19-Nov-2017 Question Paper

Question : 21 of 80

Marks: +1, -0

A mirror is placed at an angle of 30° with respect to y-axis (see figure). A light ray travelling in the negative y-direction strikes the mirror. The direction of the reflected ray is given by the vector

$i↖{\^}$
$i↖{\^}-√3j↖{\^}$
$√3i↖{\^}-j↖{\^}$
$i↖{\^}-2j↖{\^}$

Validate

Solution:

Incident Ray

= -j↖{\ ^}

Reflected Ray

Vector

⇒√ 3/2i↖{\^}-1/2j↖{\^}

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