Chapter 14 - Mirror and Lenses - 6


1. The pebbles lying at the bottom of the clear water of a river appear to be __________ up above their actual position.


2. White light disperses in different colours, which is called ___________.


3. The critical angle of glass is ___________.


4. In recent years an important application of principal of __________ is used in optical fibres.


5. 'Gastroscope' is an instrument to view the ___________.


6. Rainbow is a ____________ spectrum produced due to the dispersion of light.


7. Secondary rainbow is __________ than the primary rainbow.


8. There are _______ main types of optical defects in images produced by a lens.


9. In SI system the unit of power of lens is _________.


10. A man suffering from short sightedness cannot see ________ objects.


11. Long sightedness can be removed by a ________ lens of a suitable power.





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