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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
David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m. If he moves 1 m towards the mirror, then the distance between David and his image will be ______.
Draw a figure showing the following.
- Incident Ray
- Normal
- Angle of incidence
- Angle of reflection
- Point of incidence
- Reflected ray
Draw a neat diagram of reflecting periscope.
What is a real image?
When a ray of light strikes a plane mirror at an angle of 150 with the mirror, what will be the angle through which the ray will deviate? Illustrate with a ray diagram in the following figure.
Complete the path of incident ray in the following case.
Which of the following is the best reflector of light?
Say TRUE or FALSE
We see planets because they reflect light from the sun
An object that blocks all of the light from passing through is ______.
