Q.19 (a) If focal length of a convex mirror is 20 cm, it is dipped into a liquid carbon disulphide then what will
be the new focal length finds it.
(2M)
(b) Why does sky appear blue?
(IM)
1
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The SI unit of force is the newton, symbol N. The base units relevant to force are: The metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg. The second, unit of time — symbol s.
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