cure
Q. Assertion: Ti3+
salts
coloured where as
Ti4+salts are white.
Reason: Ti 3+ is less stable than Tout
Assertion and
are correct but reason
not correct explanation for assertion
lason
Answers
9 1.Suppose you are in a dark room. Can A
you see objects in the room? Can you see
objects outside the room? Explain.
Ans. We see objects only when light reflected
by them enters our eyes. Since no light is
reflected from the objects in a dark room. we
are not able to see them. However. outside
the room. where light is available. objects Irregular
surface
can relect light and thus. we are able to Fig. 16.1: Diffused Reflection]
see them. A. B. C. D are the parallel rays. Their
reflected rays follow the laws of reflecion.
Reflected rays are not parallel because the
9.2. Differentiate between regular and
diffused reflection. Does diffused reflection
mean the failure of the laws of reflection ? surface is irregular.
Ans.
9.3. Mention against each of the following Regular Reflection Diffused Reflection
whether regular or diffused reflection will
1.It takes place when 1.It takes place when
take place when a beam of light strikes.
light reflects from a light reflects from
Justify your answer in each case.
plane. smooth and rough surface.
(1) Polished wooden table (2 Chalk
powder (3) Cardboard surface (4) Marble
shiny surface.
2. If incident rays are 2. If incident rays are
floor with water spread over it (5) Mirror
(6) Piece of paper parallel. all the rays parallel. the rays
are parallel after are not parallel
Ans. (1 )A regular reflection takes place on
a polished wooden table because its suriace reflection. after refection.
3. Reflection from the 3. Reflection from the is smooth and polished.
plane mirror is a paper or wood is an ( 2)A diffused reflection takes place on a
chalk powder because its surface is uneve
Tegular rellecion. irregular reilection.
(3) Cardboard surface has minute irre
gularities on it. so it will have a diffustu
Diffused reflection is not due to the failure
of the laws of reflection. It is caused by the
reflection.
iTregularities in the reflecting surface.
4) Marble floor with water spread over
will have regular reflection. It will acts 1
a plane mirror.
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