# Selina Solutions Class 9 Physics Solutions for Exercise 7A in Chapter 7 - Chapter 7 Reflection Of Light

Question 3 Exercise 7A

Explain the following terms:

(a) Plane mirror

(b) Incident ray

(c) Reflected ray

(d) Angle of incidence and

(e) Angle of reflection

(a) Plane mirror – It is highly polished and a smooth reflecting surface that is prepared from a clear plane glass sheet, which is usually thin and silvered with appropriate reflecting abrasive on one of the sides. After pasting, the glass turns opaque but because of the reflecting property of the abrasive, the plane glass sheet turns into a plane glass mirror or plane glass reflector

(b) Incident ray – it is the light ray that strikes a reflecting surface

(c) Reflected ray – it is the light ray that is obtained after reflection from the surface in the same medium in which the incident ray is travelling

(d) Angle of incidence – it is the angle which the incident ray makes with the normal at the point of incidence. It is denoted by ‘i’

(e) The angle of reflection – it is the angle made by the reflected ray with the normal at the point of

incidence. It is denoted by ‘r’

Related Questions
Exercises

Lido

Courses

Teachers

Book a Demo with us

Syllabus

Maths
CBSE
Maths
ICSE
Science
CBSE

Science
ICSE
English
CBSE
English
ICSE
Coding

Terms & Policies

Selina Question Bank

Maths
Physics
Biology

Allied Question Bank

Chemistry
Connect with us on social media!