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प्रश्न
In simple microscope ______ lens is used.
विकल्प
Concave
Plano concave
Plano convex
Convex
उत्तर
In simple microscope convex lens is used.
Explanation:
A convex lens with a small focal length produces a virtual, erect, and bigger image of an object. Such a lens is called a simple microscope or magnifying lens. Using such microscopes, one can get a 20-times larger image of an object.
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संबंधित प्रश्न
What happens to the image distance in the eye when we increase the distance of an object from the eye?
The change in focal length of an eye lens is caused by the action of the ______.
Write the name.
The sensation on the retina persists for a while is
Write the name.
The persons which are unable to distinguish between different colours
Write an Explanation.
Persistence of vision
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The 'eye muscles' are controlled by which cranial nerves?
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A: Increasing the field of view
B: Bringing three-dimensional view
C: Developing the concept of distance/size
Then the correct option is/are
The ability of the eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called:
The focal length of the eye lens increases when eye muscles ____________.
In the blind spot of the human eye ______.
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A person from bright sunlight outside enters a poorly lit room and feels blinded for a short while.
Define the following term:
Adaptation
Differentiate between members of the following pair with reference to what is asked in the bracket.
Near and distant accomodation (shape of lens).
Differentiate between members of the following pair with reference to what is asked in the bracket.
Dark and light adaptation (pigments which will be regenerated).
The figures (A) and (B) given below are showing some kind of adjustment. Study the figures and answer the questions that follow.
| A |  |
 |
B |
- Identify the kinds of adjustments done in the figures (A) and (B).
- Distinguish between the adjustments of figures (A) and (B) on the basis of:
- The size of pupil.
- The pigment which gets regenerated.
- Cells of the retina.
