Q. 79 A4.2( 15 Votes )
Draw a labelled diagram showing how a plane mirror forms an image of a point object placed in front of it.
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State the characteristics of the image formed in a plane mirror.Lakhmir Singh & Manjit Kaur - Science
As the angle between two plane mirrors is decreased gradually, the number of images of an object placed between them:Lakhmir Singh & Manjit Kaur - Science
The eye of a person exhibits a phenomenon X due to which it can see the image of an object for a short duration of Y even after the object has disappeared from his view. It is due to the phenomenon X that we are able to see moving Z on a television screen. What are X, Y and Z?Lakhmir Singh & Manjit Kaur - Science
A man stands 10 m in front of a large plane mirror. How far must he walk before he is 5 m away from his image?Lakhmir Singh & Manjit Kaur - Science
The number of images formed of an object placed between two plane mirrors inclined at right angles to each other is:Lakhmir Singh & Manjit Kaur - Science
How many images of an object will be formed when the object is placed between two plane mirrors which are inclined at the following angles to one another?
(e) 90°Lakhmir Singh & Manjit Kaur - Science
Two plane mirrors are set at right angles to each other. A coin is placed in-between these two plane mirrors. How many images of the coin will be seen?Lakhmir Singh & Manjit Kaur - Science
Explain why, when an object is placed between two plane mirrors inclined at an angle, then multiple images are formed.Lakhmir Singh & Manjit Kaur - Science
What will be the number of images formed when an object is placed between two parallel plane mirrors facing each other?Lakhmir Singh & Manjit Kaur - Science
Fill in the following blanks with suitable words:
(a) The angle of ................ equals the angle of reflection.
(b) A person 1 m in front of a plane mirror seems to be......... m away from his image.
(c) If you touch your.........ear with right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with..........
(d) The size of pupil becomes...........when you see in dim light.
(e) Night birds have.........cones than rods in their eyes.
(f) The image of an object persists on the retina of an eye for about.........second even after the object has disappeared.
(g) If the still pictures of a moving object are flashed on our eyes at a rate faster than..............pictures per second, the eye perceives the object as moving.
(h) In a movie, the still pictures in proper sequence are projected on the screen usually at the rate of ...........pictures per second.Lakhmir Singh & Manjit Kaur - Science