A ray of light makes an angle of $10^{\circ}$ with the horizontal above it 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^{\circ}

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50^{\circ}

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80^{\circ}

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100^{\circ}

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Solution

The correct option is A $40^{\circ}$
From figure
$θ + θ + 10 = 90 \Rightarrow θ = 40^{\circ}$

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A ray of light makes an angle of 10∘ with the horizontal above it 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

The correct option is A 40∘From figure θ+θ+10=90⇒θ=40∘

A ray of light makes an angle of $10^{\circ}$ with the horizontal above it 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

The correct option is A $40^{\circ}$
From figure
$θ + θ + 10 = 90 \Rightarrow θ = 40^{\circ}$