Question

A steady candle is fixed on the table. A glass plate is held into the luminous zone
of the flame for about 10 seconds
(a) What is seen on the glass plate?
(b) What does it indicate?​

Answer 1

A. there will become an impression of black circle on it...

B. this indicates that is is Unburnt carbon particles in the luminous zone...

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Answer 2

Hey mate!

A black circle will be seen on the glass plate which indicates the unburnt carbon produced during the combustion.

HOPE THIS HELPS !!!