Solved Examples For Light- Shadows and Refraction
Light - Shadows and Refraction of Class 6
Solved Problems
1.Why empty cardboard cartons act as dark room?
Sol. Cardboard being an opaque object does not allow light to pass through it.
2.Why do we need to classify objects into different classes?
Sol. We need to classify objects into different classes to ease their study.
3.Why are shadows formed?
Sol. Because of the property of light to travel in straight line.
4.Why do opaque objects form dark shadows?
Sol. Because of light in not able to pass through them and where there is not light, it is dark.
5.Tell the shape of an object which would give a circular shadow when held one way and a rectangular shadow when held in some other way.
Sol. A cylinder
Fill in the Blanks
1.Objects which light are called ____________.
Sol. luminous
2.Objects which do not emit light are called ___________.
Sol. non–luminous
3.Objects which do not allow light pass through them are called ____________.
Sol. opaque
4.A shadow is region of ___________ light it appears as a _________ patch behind the obstacle.
Sol. no, dark
5.The central perfectly dark portion of the shadow is called ___________ whereas the partially dark portion of the shadow which surrounds the umbra is called _________________.
Sol. umbra, penumbra
6.Light travels along a ___________________.
Sol. straight line
7.Mirrors _________ light falling on them.
Sol. Reflects
