Class 10 Exam > Class 10 Notes > Very Short Questions: Light Reflection and Refraction
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:
(i) concave mirror
(ii) convex mirror
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.
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:
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