{"id":3668,"date":"2023-01-05T10:13:11","date_gmt":"2023-01-05T10:13:11","guid":{"rendered":"https:\/\/theexampillar.com\/ncert\/?p=3668"},"modified":"2023-01-31T07:00:36","modified_gmt":"2023-01-31T07:00:36","slug":"ncert-solutions-class-8-science-chapter-16-light","status":"publish","type":"post","link":"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-science-chapter-16-light\/","title":{"rendered":"NCERT Solutions Class 8 Science Chapter 16 Light"},"content":{"rendered":"

NCERT Solutions Class 8 Science\u00a0<\/span><\/h2>\n

The NCERT Solutions in English Language for Class 8 Science Chapter – 16 (Light) <\/strong>has been provided here to help the students in solving the questions from this exercise.<\/span><\/p>\n

Chapter – 16 (Light)<\/span><\/h2>\n

1. Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.
\n<\/strong>Answer –\u00a0<\/strong>No, we cannot see the objects in a dark room because we need a source of light to make the objects visible. We can see an object only when it reflects the light falling on it towards our eyes. If the light is available outside the room, then the objects present would reflect it and hence we would be able to see objects.<\/span><\/p>\n

2. Differentiate between regular and diffused reflection. Does diffused reflection mean the failure of the laws of reflection?
\n<\/strong>Answer –\u00a0<\/strong>The difference between Regular and diffused reflection is<\/span><\/p>\n

\n\n\n\n\n\n\n\n
Regular Reflection<\/strong><\/span><\/td>\nDiffused Reflection<\/strong><\/span><\/td>\n<\/tr>\n
Rays of light falls on smooth surface<\/span><\/td>\nRays of light falls on irregular surface.<\/span><\/td>\n<\/tr>\n
Rays are reflected parallely.<\/span><\/td>\nRays are reflected in different directions.<\/span><\/td>\n<\/tr>\n
Reflection is clear.<\/span><\/td>\nReflection is not clear.
\n<\/span><\/td>\n<\/tr>\n
Example – Reflection by the plane mirror.
\n<\/span><\/td>\n		Example – Reflection by the road surface.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

No, diffused reflection does not mean failure of law of reflection. It is caused by the irregularities of the reflecting surface The laws of reflection are valid at each point on the surface of an object.<\/span><\/p>\n

3. Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case.
\n<\/strong>(a)<\/strong> Polished wooden table
\n(b)<\/strong> Chalk powder
\n(c)<\/strong> Cardboard surface
\n(d)<\/strong> Marble floor with water spread over it
\n(e)<\/strong> Mirror
\n(f)<\/strong> Piece of paper<\/span><\/p>\n

Answer –<\/strong><\/span><\/p>\n\n\n\n\n\n\n\n\n\n
Question<\/strong><\/span><\/td>\nReflection Type<\/strong><\/span><\/td>\nExplanation<\/strong><\/span><\/td>\n<\/tr>\n
Polished wooden table\u00a0<\/strong><\/span><\/td>\nRegular Reflection<\/span><\/td>\nA polished wooden table has a smooth surface, so the reflection on a polished table will be regular reflection<\/span><\/td>\n<\/tr>\n
Chalk powder<\/strong><\/span><\/td>\nDiffused Reflection<\/span><\/td>\nChalk powder if spread on a surface makes the surface diffused, so the reflection on a chalk powder is diffused reflection<\/span><\/td>\n<\/tr>\n
Cardboard surface\u00a0<\/strong><\/span><\/td>\nDiffused Reflection<\/span><\/td>\nCardboard surface is not smooth, so the reflection will be a diffused reflection<\/span><\/td>\n<\/tr>\n
Marble floor with water spread over it<\/strong><\/span><\/td>\nRegular Reflection<\/span><\/td>\nMarble floor with water spread over it is a smooth reflection. Water makes the marble smooth, so the reflection on the marble floor will be a regular reflection<\/span><\/td>\n<\/tr>\n
Mirror\u00a0<\/strong><\/span><\/td>\nRegular Reflection<\/span><\/td>\nMirror has a smooth surface, so the reflection on the mirror is a smooth reflection<\/span><\/td>\n<\/tr>\n
Piece of paper<\/strong><\/span><\/td>\nDiffused Reflection<\/span><\/td>\nSince the surface of a piece of paper will be rough, it would produce a diffused reflection<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

4. State the laws of reflection.
\n<\/strong>Answer –\u00a0<\/strong>The laws of reflection are – <\/span><\/p>\n