If A and B are the angle of incidence and reflection respectively, then which of the following statement(s) is/are true with respect to the first law of reflection?

A + B = 90^{\circ}

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A - B = 0^{\circ}

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A + B = 180^{\circ}

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\frac{A}{B}

= 1

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Solution

The correct options are
B $A - B = 0^{\circ}$
D $\frac{A}{B}$ = 1
Given: Angle of incidence = A, angle of reflection = B.
According to the first law of reflection, the angle of incidence is always equal to the angle of reflection. So in this case, A and B are equal to each other, i.e. A = B $⟹$ $\frac{A}{B}$ = 1.
Also $A - B = 0^{\circ}$ .

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