Last updated on August 30th, 2023 at 12:57 am
Class 7 Chapter Light Important Notes
Get detailed notes on Class 7 Chapter Light from experienced tutors. Our notes cover all important topics and provide a comprehensive overview of the chapter.
Multiple Choice Questions
Which of the following is a form of energy that enables us to see things around us?
- a) Sound
- b) Heat
- c) Light
- d) Electricity
Answer: c) Light
When light strikes a smooth, polished surface, it gets reflected at which angle?
- a) A random angle
- b) 90 degrees
- c) The same angle as the incident ray
- d) None of the above
Answer: c) The same angle as the incident ray
What is the angle between the incident ray and the normal called?
- a) Angle of incidence
- b) Angle of reflection
- c) Angle of deviation
- d) None of the above
Answer: a) Angle of incidence
Which type of mirror always forms virtual images that are smaller than the object?
- a) Concave mirror
- b) Convex mirror
- c) Plane mirror
- d) None of the above
Answer: b) Convex mirror
State True or False .
Match the following with their descriptions:
| Column A | Column B |
| Concave mirror | Curves outward like the back of a spoon |
| Convex mirror | Curves inward like a bowl |
| Reflection | Bending of light when it passes through a medium |
| Refraction | Process by which light bounces back from a surface |
| Prism | Triangular piece of glass that can split white light into its different colors |
| Angle of incidence | The fastest known speed in the universe |
| Speed of light | The angle between the incident ray and the normal |
| Retina | Innermost layer of the eye that contains photoreceptor cells |
Answers
Concave mirror – Curves inward like a bowl
Convex mirror – Curves outward like the back of a spoon
Reflection – Process by which light bounces back from a surface
Refraction – Bending of light when it passes through a medium
Prism – Triangular piece of glass that can split white light into its different colors
Angle of incidence – The angle between the incident ray and the normal
Speed of light – The fastest known speed in the universe
Retina – Innermost layer of the eye that contains photoreceptor cells
Definitions:-
Define Light.
Light is a form of energy that enables us to see things around us.
Define Reflection.
Reflection is the process by which light bounces back from a surface it cannot pass through.
Define Refraction.
Refraction is the bending of light when it passes through a medium such as water or glass.
Define Angle of incidence.
The angle between the incident ray and the normal is called the angle of incidence.
Define Angle of reflection.
The angle between the reflected ray and the normal is called the angle of reflection.
Define Concave mirror.
A concave mirror is a mirror that curves inward like a bowl, and it can form both real and virtual images depending on the position of the object.
Define Convex mirror.
A convex mirror is a mirror that curves outward like the back of a spoon, and it always forms virtual images that are smaller than the object.
Define Retina.
The retina is the innermost layer of the eye, which contains photoreceptor cells that detect light and send signals to the brain.
Define Prism.
A prism is a triangular piece of glass that can split white light into its different colors.
Define Spectrum.
The spectrum is the range of colors that can be seen when white light is split using a prism or other means.
