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Class 10 Science Chapter 9 Question Answers - Light Reflection and Refraction

Q1. Draw a schematic representation of different type of mirrors.
Ans: Types of mirror:

  • Plane mirror
  • Spherical mirror
    (i) concave mirror
    (ii) convex mirror

Plane mirror:
Class 10 Science Chapter 9 Question Answers - Light Reflection and Refraction

(i) concave mirror
Class 10 Science Chapter 9 Question Answers - Light Reflection and Refraction

(ii) convex mirror
Class 10 Science Chapter 9 Question Answers - Light Reflection and Refraction

Q2: Define focal length.
Ans: 
Focal length (f): The distance between the pole and principal focus (F) of a spherical mirror is called the focal length of the mirror. It is denoted by f.

Class 10 Science Chapter 9 Question Answers - Light Reflection and Refraction

Q3: Define one dioptre.
Ans: 1 dioptre is the power of a lens whose focal length is 1 metre. 1 D = 1 m-1

Q4: Define focus.
Ans:
Principal focus: A point on the principal axis of a spherical mirror where the rays of light parallel to the principal axis meet or appear to meet after reflection from the spherical mirror is called principal focus.

Q5: What is concave and convex mirror?
Ans:

  • Concave mirror: A spherical mirror, whose reflecting surface is curved inwards, that is it faces towards the centre of the sphere, is called a concave mirror.
  • Convex mirror: A spherical mirror whose reflecting surface is curved outwards, is called a convex mirror.

Q6: Define

  • Reflection of light
  • Beam of light

Ans:

  • Reflection: When light falls on a surface and bounces back to the medium, the phenomena is called reflection.
  • Beam: A beam is a bundle of rays, which originates from a common source and travels in the same direction.

Q7: Define light and write its properties.
Ans: 
Light: It is a form of energy which produces the sensation of sight.

  • Light exhibits dual nature i.e., wave as well as particle nature.
  • It travels with speed of 3 × 108 m/s in vacuum. However, speed is inversely proportional to optical density of medium.

Q8: Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (i) from air into water.
Ans:

Class 10 Science Chapter 9 Question Answers - Light Reflection and Refraction

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