Question

Following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A.(c) A is true but R is false. (d) A is false but R is true. Assertion (A) : A ray passing through the centre of curvature of a concave mirror after reflection, is reflected back along the same path. Reason (R) : The incident rays fall on the mirror along the normal to the reflecting surface.​

Answer 1

Answer:

Both A and R are true and R is the correct explanation of A.

Explanation:

A ray of light passing through the centre of curvature of a concave mirror retraces its path (gets reflected along the same path), because as the ray of light passes through centre of curvature of a concave mirror it strikes the mirror along the normal i.e. it incidences on to the mirror at 90 degree. Hence the incident ray coincides with the normal.

Answer 2

Assertion (A): A ray passing through the centre of curvature of a concave mirror after reflection, is reflected back along the same path. Reason (R) : The incident rays fall on the mirror along the normal to the reflecting surface.​

• Since the incidence angle & the cogitation of the angle for a concave lens lie all along with standard, lighting traveling on the midpoint of the circle is refracted on a similar path.
• This point of contact would be at 90 degrees, where the radius of curvature is perpendicular to the tangent, allowing the incident as well as reflected rays to collide.

• When a beam of light goes through to the midpoint of the sphere of a concave mirror, it pounds it along the normal path and falls on it at a 90-degree angle. As a result, the incident beam is the same as the normal.

• As a consequence, the incidence angle is equivalent to 0.
• As we know, the reflected angle equals 0 according to the law of cogitation, therefore the reflected angle tends to zero, and the beam of light pulls back its route.

Therefore, both assertion and reason are true.