Question
Explain the following with the help of a diagram :
Compound microscope
Compound microscope
✓
Answer
(i) A compound microscope is made of two convex lenses objective and eye piece.
(ii) The axes of both lenses are along the same line. The lenses are fitted inside a metallic tube in such a way that the distance between can be changed.
(iii) The objective has smaller cross-section and smaller focal length. The eye piece has bigger cross section, its focal length is also larger than that of the objective.
(iv) Higher magnification can be obtained by the combined effect of the two lenses.
(v) The magnífication occurs in two stages. The image formed by the first lens acts as the object for the second lens.
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Disasters can be properly classified into three categories, viz. natural disasters, technological disasters and man-made disasters. The forces that cause natural disasters cannot be controlled. Moreover, they are becoming more frequent in the current years due to phenomena of climate change. On and off incidences of cyclones, cloud bursting, floods, etc. am creating havoc in the lives of people. Technological disasters are due to improper and callous behaviour at the different processes carried out in technical establishments. Man-made disasters are conflicts arising due to different religions, regions and-terrorism.
1.What are three broad areas of disasters?
2.Which disasters cannot be controlled? Why?
3.Which type of disasters were very common in Western Maharashtra in recent times? Why?
4.Give any one example of technological disaster that shook the entire India.
5.Which types of disasters can be controlled in order to lead happy, peaceful and secured life? How?
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i. Identify the above diagram.
ii. Write the principle on which the above appliance works.
iii. write the working of the above appliance.
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