NCERT Important Questions Class 8 Science chapter 13 with Answer solution with pdf. Here We Provides Class 1 to 12 all Subjects NCERT Solution with Notes, Question Answer, CBSE and HBSE Important Questions, MCQ and old Question Papers for Students.
- Also Read :- Class 8 Science NCERT Solution
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CBSE and HBSE Solution of Class 8 Science chapter 13 Light important Questions And Answer solution.
Class 8 Science Chapter 13 Important Questions and Answer
Q.1 What is Light?
Ans – Light is the collection of small particles called photons. These photons have the property of particle as well as a wave. White light is a combination of multiple colours.
Q.2 What is Incident ray?
Ans – The Ray of light that comes for strike to an object is called incident ray.
Q.3 What is reflected ray?
Ans – The ray of light that goes away after reflection from an object is called reflected ray.
Q.4 Describe law of Reflection. ( Most Important )
Ans – Light follows two laws of reflection. see image for understanding better
- The incident ray, reflected ray and normal all lie in the same plane.
- The angle of incidence is equal to the angle of reflection. i.e ∠i = ∠r.
Q.5 What kind of image is formed in the mirror?
Ans – An image formed in the mirror, the left of an object becomes right and right becomes left. Such phenomenon is called lateral inversion.
Q.6 What is Diffused or irregular reflection?
Ans – When all the parallel rays reflected from the irregular shape or rough surface and then goes into multi-direction is called irregular reflection.
Q.7 What is regular reflection?
Ans – Reflection from the smooth surface like a mirror is called regular reflection.
Q.8 What is Kaleidoscope and where it is used?
Ans – Kaleidoscope reflects light again and again. Kaleidoscope is used by designers in making a new design.
Q.9 What are the major part of the human eye? ( Most Important )
Ans – There are Cornea, iris, pupil, lens, retina and optic nerves that help us to see an object. See eye diagram for more.
- Lens- The lens serves to transmit the rays falling on our eye to the retina.
- Retina- It helps us to see the size and shape of an object. When the lens focuses the rays of light and reaches the retina, the retina sends it to our brain through the nervous system.
- Ciliary muscle – It works to keep our lens balanced.
- Pupil- It controls the light entering our eye. Our pupil becomes larger in dim light and smaller in bright light. So that there is no harm to the eye.
- Iris – It gives color to eye.
- Cornea – This is the outer white part of our eye. It works to protect our eyes from the external environment. The white part of our eye is the cornea.
Q.10 How to take care of our eyes?
Ans – Our eye helps in observing objects. so we need to take care of our eyes. Here are the following points that keep safe our eyes.
- Use Suitable Spectacles
- Too little, Too high light is dangerous for eyes.
- Don’t look at sun or any powerful source of light directly
- Always read at a normal distance ( 25 cm ).