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## Tuesday, November 22, 2011

### CBSE I NCERT Class X Chapter: Light-Reflection and Refraction Quiz Questions

Question: 1.  Why do we prefer a convex mirror as a rear-view mirror in vehicles?

Question: 2.  Name the mirror that can give an erect and enlarged image of an object?

Question: 3.  What could be the position of the object if the image formed by a concave mirror is observed
to be virtual, erect and larger than the object?

Question: 4.  Is the optical centre always at the centre of lens?

Question: 5.  When the image formed is virtual and erect, what is the magnification,  positive or negative?

Question: 6. When the image formed is real and inverted, what is the magnification,  positive or negative?

Question: 7.  Is mirror formula valid only for the plane mirror?

Question: 8.  Which light will refract more, a violet or red, if they pass through the same  glass slab with the
same angle of incident?

Question: 9.  Does Snell’s law fail, if yes than when?

Question: 10.  What is a lens?

Answers for above Questions

Answer: 1.  Convex mirrors enable the driver to view much  larger area than would be  possible with a plane
mirror.

Answer : 2.  When an object is placed between the pole and  the principal focus of  a concave mirror, the
image formed is virtual, erect, and enlarged

Answer:  3.  If the image formed by a concave mirror is virtual, erect and larger than the  object, the position
of the object should be between the pole of the mirror  and its principal focus.

Answer:  4.  No, only if both the curved surfaces are symmetrical, optical centre will be at  the centre.

Answer:  5.  When the image formed is virtual and erect, magnification is positive.

Answer:  6.  When the image formed is real and inverted magnification is negative.

Answer:  7.  No, the mirror formula is valid for plane as well as for all spherical mirrors for  all positions of
the object.

Answer:  8.  Violet light will refract more than the red light, because its wavelength is less  than that of red.

Answer:  9.  Snell’s law fails when the light rays incident normally on the surface of a  refracting medium. In
this case light passes un deviated from the surface i.e. no refraction occurs.

Answer:  10.  A lens is a portion of a transparent refracting medium bounded by two  spherical surfaces,
generally spherical or cylindrical or one curved and one  plane surface. It has a perfect or approximate axial
symmetry which  transmits and refracts light.

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