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An object is held 20 cm away from a converging lens of focal length 10 cm. Find the position of the image formed.
Concept: Magnification
Complete the following table:
| Instrument | Number of Convex Lenses |
Use |
| Simple Microscope | .............. | .............. |
| Compound Microscope | .............. | .............. |
| Telescope | .............. | .............. |
Concept: Convex 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.
Concept: Convex Lens
The image obtained while finding the focal length of convex lens is ....................
Concept: Convex Lens
Observe the following figure and answer the questions.
a) Which optical instrument shows arrangement of lenses as shown in the figure?
b) Write in brief the working of this optical instrument.
c) How can we get different magnifications in this optical instrument?
d) Draw the figure again and labelled it properly
Concept: Convex Lens
Yesh find out F1 and F2 of symmetric convex lens experimentally then which conclusion is true.
Concept: Convex Lens
At which position will you keep an object in front of convex lens to get a real image smaller than the object? Draw a figure.
Concept: Magnification
Observer the following diagram and answer the questions.
a) Which eye defect is shown in this diagram?
b) What are the possible reasons for this eye defect?
c) How this defect is corrected, write it in brief?
Concept: Defects of Vision and Their Corrections > Myopia
Observe the following figure and complete the table:
| Points | Answer |
| (i) Position of the object | |
| (ii) Position of the image | |
| (iii) Size of the image | |
| (iv) Nature of the image |
Concept: Convex Lens
Surabhi from std. X uses spectacle. The power of the lenses in her spectacle is 0.5 D.
Answer the following questions from the given information:
- Identify the type of lenses used in her spectacle.
- Identify the defect of vision Surabhi is suffering from.
- Find the focal length of the lenses used in her spectacle.
Concept: Power of a Lens
State two uses of a concave mirror.
Concept: Spherical Mirrors
Rewrite the following table so as to match second and third column with first column.
|
Column I
|
Column II
|
Column III
|
|
(i) Myopia
|
Old age problem
|
Bifocal lens
|
|
(ii) Presbyopia
|
Nearsightedness
|
Concave lens.
|
Concept: Defects of Vision and Their Corrections > Myopia
Choose the correct alternative and rewrite the following:
Mirror used by a dental surgeon is ..........................
Concept: Spherical Mirrors
A _____________ mirror is used by a dentist.
Concept: Spherical Mirror > Concave Mirror
Concept: Spherical Mirror > Concave Mirror
In which equipment/s do you find ___________________
Concept: Spherical Mirror > Concave Mirror
My grandfather uses a bifocal lens in his spectacle. Explain why.
Concept: Images Formed by Sperical Lenses
If an object is placed in front of a convex lens beyond 2F1, then what will be the position, relative size, and nature of an image which is formed? Explain with a ray diagram.
Concept: Convex Lens
Concept: Convex Lens
Answer the following question:
Distinguish between the convex mirror and the concave mirror.
Concept: Spherical Mirrors
