Q5 of 45 Page 302

Fill the table with the appropriate words given in bracket.




(Convex mirror, Plano convex, concave mirror, Plane mirror, convex lens, Concavelens)


Concave mirror, convex mirror.

Explanation: Concave mirrors are used by dentist’s to get the upright and magnified (at a short range i.e. the object length must be smaller than the focal length of the mirror) image of the tooth or the soft tissues of the mouth.


Convex mirrors are used as the rear view mirror in cars as it gives an upright image and a wider field of view.


More from this chapter

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3

The ray diagram shown below is introduced to show how a concave mirror forms theimage of an object.


i) Identify the mistake and draw the correct ray diagram.


ii) Write the justifications for your corrections.


 4

In traffic signals _________ colour light is used to stop vehicles because it has ______wave length. (Hint: scattering of light is inversely proportional to the fourth power of its wavelength)

 6

Write down the names of the specified parts of the human eye.

i) Dark muscular diaphragm that controls the pupil.


ii) The screen where the image is formed by the eye lens.


 7

You know that myopia is a common refractive defect of vision. A person with this defect can clearly see only objects that are near. Using concave lens of suitable power this defect is corrected.

i) Mention the other two types of defects.


ii) Explain how they can be corrected.