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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
Select the correct alternative
A man standing in front of a plane mirror finds his image to be at a distance of 6 meter from himself. The distance of man from the mirror is
What do you mean by reflection of light?
State which surface of a plane mirror reflects most of the light incident on it: the front smooth surface or the back silvered surface.
A light ray is incident normally on a plane mirror. What is the direction of reflected ray? Show it on a diagram.
Describe the principle of simple periscope through an outline ray diagram. Give one of its uses.
Dull materials reflect light.
Which of the following ray diagrams is correct for the ray of light incident on a lens shown in figure?
 |
 |
| A | B |
 |
 |
| C | D |
An object that blocks all of the light from passing through is ______.
Play with a mirror
Write your name with a sketch pen on a thin sheet of paper, polythene or glass. Read your name on the sheet while standing in front of a plane mirror. Now look at your image in the mirror.
