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प्रश्न
State two advantages and two disadvantages of the reflecting periscope.
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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
Write true or false of the following statement.
The image formed by a plane mirror can be obtained on a screen.
The following diagram shows a point object O placed in front of a plane mirror. Take two rays from the point O and show how the image of O is formed and seen by the eye.
A light ray is incident normally on a plane mirror. What is the direction of reflected ray? Show it on a diagram.
Draw two sets of rays of light to show the formation of an image of the letter as shown in figure p.
Complete the path of incident ray in the following case.
Which of the following ray diagrams is correct for the ray of light incident on a lens shown in figure?
 |
 |
| A | B |
 |
 |
| C | D |
______ through which light can pass completely.
______ through which light cannot pass.
