Question

According to the first law of reflection, which angles will be equal?
                            

A. A=C
B. B=D
C. A=B
D. B=C

Answer 1

Hint: We can solve this problem with the laws of reflections. We have studied that light travels as wavefronts. Light shows different phenomena such as refraction, reflection, polarisation etc. Reflection is a phenomena in which the change of the direction of the wavefront occurs at the interaction between the two media. Light, sound and the water waves have reflection properties.

Complete answer:
The common example where the reflection occurs are plane mirror convex mirror and the concave mirror. Flat surface forms a mirror image after the reflection. There are some laws which applicable on reflection concept, such as:
(I) The incident ray, reflected ray and the normal to the surface at the incident point lie in the same plane.
(II) The angle of incidence is equal to the angel of reflection.
The angel which the incident ray makes with the normal is known as incident angel or angle of incidence and the angel which the reflected ray makes to the same normal called as reflected angel or angle of reflection. Both the incident ray and the reflected ray are present on the opposite sides of normal.
In the given question, B is the angle of incidence and C is the angle of reflection so these two angles are equal to each other.

So, the correct answer is “Option D”.

Note:
There are many natural phenomena in nature which are seen due to reflection such as rainbows and mirages. In the given question, students are often confused with the angel A and angel D that these angels are the incident angle and reflected angle, therefore we have to be careful in solving the question.