Question

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. $A+B={90}^{\circ }$
• B. $A-B=0^{\circ }$
• C. $A+B={180}^{\circ }$
• D. $\frac{A}{B}$ = 1

Answer 1

Answer: (B), (D)

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 $A-B=0^{\circ }$.