A ray of light makes an angle of 20-o with the horizontal and strikes a plane mirror which is inclined an angle theta to the horizontal- The angle theta which the reflected ray becomes vertical- is-40-o80-o35-o100-o

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A ray of light makes an angle of 20o with the horizontal and strikes a plane mirror which is inclined at an angle θ to the horizontal. The angle θ for which the reflected ray becomes vertical, is?40o80o35o100o

A ray of light makes an angle of $20^{o}$ with the horizontal and strikes a plane mirror which is inclined at an angle $θ$ to the horizontal. The angle $θ$ for which the reflected ray becomes vertical, is?
$40^{o}$
$80^{o}$
$35^{o}$
$100^{o}$