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प्रश्न
State two advantages and two disadvantages of the reflecting periscope.
उत्तर
Advantages of Reflecting Periscope:
- It is used to see above the head of crowds.
- It is used by soldiers in trench warfare.
Disadvantages of Reflecting Periscope:
- The final images is not brightly illuminated as light energy is absorbed due to two successive reflections.
- Any deposition of moisture of dust on the mirror reduces the reflection almost to nil, and hence, the periscope cannot be used in places where there is a lot of dust or moisture.
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संबंधित प्रश्न
State the characteristics of the image formed by a plane mirror.
Figure shows an incident ray AO and the normal ON on a plane mirror. The angle which the incident ray AO makes with mirror is 30°. (a) Find the angle of incidence. (b) Draw the reflected ray and then find the angle between the incident and reflected rays.
The diagram in Figure shows a point object P in front of a plane mirror MM1.
(a) Complete the diagram by taking two rays from the point P to show the formation of its image.
(b) In the diagram, mark the position of eye to see the image.
(c) Is the image formed real or virtual? Explain why?
The diagram below in figure shows an object XY in front of a plane mirror MM1 . Draw on the diagram, path of two rays from each point X and Y of the object to show the formation of its image .
A ray is incident on a plane mirror . Its reflected ray is perpandicular to the incident ray . Find the angle of incidence .
Draw diagrams to show the difference between regular and irregular reflection.
The word PLATE written on a paper is held in front of a plane mirror. Write down the letters as seen in the following case.
The paper is held parallel to the mirror.
Complete the ray diagram to show the image observed by the eye after reflection in the following figure.
______Surface reflects the light well.
Suppose we wish to obtain the real image of a distant tree. Explain two possible ways in which we can do it.
