- #1
Amith2006
- 427
- 2
Sir,
1) A beam of light incident on a plane mirror forms a real image on reflection. It is said that the incident beam in that case is convergent. Is it true?
I think it is due to the fact that a plane mirror normally forms virtual images of real object. In order that a real image be formed by it, the object should be virtual and only a convergent beam of light can produce a virtual object. Is my argument right?
2) What is the nature of the picture seen on the screen of a pin hole camera? Is it an image or a Shadow?
I think it’s an image. What do you say Sir?
3) A ray reflected successively from 2 plane mirrors inclined at a certain angle undergoes a deviation of 300 degrees. How many images are observable?
I solved it in the following way:
We know that the deviation produced by 2 plane mirrors inclined at an angle y is 180 + 2y.
Therefore 180 + 2y = 300
y = 60
Here it is assumed that the object is placed symmetrically between the 2 inclined mirrors. We know that number of images observed = (360/y) – 1
= 5
Is it right?
1) A beam of light incident on a plane mirror forms a real image on reflection. It is said that the incident beam in that case is convergent. Is it true?
I think it is due to the fact that a plane mirror normally forms virtual images of real object. In order that a real image be formed by it, the object should be virtual and only a convergent beam of light can produce a virtual object. Is my argument right?
2) What is the nature of the picture seen on the screen of a pin hole camera? Is it an image or a Shadow?
I think it’s an image. What do you say Sir?
3) A ray reflected successively from 2 plane mirrors inclined at a certain angle undergoes a deviation of 300 degrees. How many images are observable?
I solved it in the following way:
We know that the deviation produced by 2 plane mirrors inclined at an angle y is 180 + 2y.
Therefore 180 + 2y = 300
y = 60
Here it is assumed that the object is placed symmetrically between the 2 inclined mirrors. We know that number of images observed = (360/y) – 1
= 5
Is it right?