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प्रश्न
Can a normal convex lens behave like a concave lens and vice-versa?
उत्तर
Yes, If a lens is kept in a medium whose refractive index is more than that of the material of the lens, the normal convex lens starts behaving like a concave lens and vice-versa.
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संबंधित प्रश्न
Complete the following table:
| Instrument | Number of Convex Lenses |
Use |
| Simple Microscope | .............. | .............. |
| Compound Microscope | .............. | .............. |
| Telescope | .............. | .............. |
Draw a labelled ray diagram to show how a ray of light passes through a parallel sided glass block:
if it hits the glass block at 90° (that is, perpendicular to the glass block)
Fill in the following blank with suitable word:
The image in a convex lens depends upon the distance of the ........... from the lens.
What is a lens?
You eye contains a convex lens. Why is it unwise to look at the sun?
Draw a diagram to represent the second focus of a convex lens.
A lens forms an erect, magnified, and virtual image of an object. Name the type of lens.
i. Which type of microscope has the arrangement of lenses shown in the adjoining figure?
ii. Label the figure correctly.
iii. Write the working of this microscope.
iv. Where does this microscope used?
v. Suggest a way to increase the efficiency of this microscope.
Convex lens is also known as ______.
The above image shows a thin lens with a focal length of 5m.
- What is the kind of lens shown in the above figure?
- If a real inverted image is to be formed by this lens at a distance of 7m from the optical centre, then show with calculation where should the object be placed.
- Draw a neatly labelled diagram of the image formation mentioned in (ii).
