Question

Give reasons for the following statements.

1. We cannot see things kept in dark.

2. We see our erect image in the mirror at home.

3. A light ray incident normally on a mirror retraces its path.

4. when we raise our left hand in mirror, it appears that our right hand is raised.

5. If a red rose is seen in green light, it appears darker​

Answer 1

1. We see an object when light falls on it and gets reflected from its surface and enters our eyes. In a dark room, there is no source of light. Thus, no light falls on the surface of objects and hence we do not see them. This is why we cannot see the objects in a dark room.
2. It is due to the reason that plane mirrors, the commonly used household mirrors, always form images which are virtual, erect and possess the same size and shape as that of the object.
3. For a ray incident normally on a mirror, the ray falls along the normal to mirror. Therefore, angle of incidence, i=00. As angle of reflection (r)= angle of incidence =00, therefore, reflected ray goes along the normal. Hence, the ray retraces its path.
4. If we raise our left hand in front of a plane mirror the image will raise its right hand,this is because of the process called LATERAL INVERSION. If we stand before a plane mirror and move our left hand,our image appears to move right hand. This sideways reversal of the image is known as lateral inversion.
5. Objects appear a certain colour because only certain colour's of light are reflected of by them. Similarly a red rose reflect red light of its surface making it red. When a red rose is seen in green light, it absorbs the green light and the petals appear black as no light is reflected by the rose.

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Answer 2

Explanation:

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