"laws of reflection of light are not applicable to curved surfaces" Is it correct? (ASI)
How do you find the focal length famoncave mirror(AS1)
Answers
Answer:
Question: "laws of reflection of light are not applicable to curved surfaces" Is it correct? (ASI)
Answer:
1) Laws of reflection of light do not applicable for
curved surfaces.- this is wrong.
2) Whether the surface is plane or curve, they
must follow the laws of reflection when
reflection takes place.
Question: How do you find the focal length of a concave mirror?(AS1)
Answer:
1) Hold a concave mirror such that
sunlight falls on it.
2) Take a small paper.
3) Slowly move the paper in front of the
mirror and find out the point where we
get the smallest and brightest spot,
which will be the image of the sun.
(See to it that our paper is small so that
it does not obstruct the incoming sun
rays.)
4) The rays coming from the sun parallel
to the principal axis of concave mirror
converge to a
point. This point is called Focus or
focal point(F) of the concave mirror.
5) Measure the distance of this spot from
the pole of the mirror.
This distance is the focal length(f) of
the mirror.
6) The radius of curvature will be twice
this distance (R=2f).
Hopefully it will help you!
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