The paper by Dr Lalit Kishore[1], then Principal Kendriya Vidyalaya No. 2, NFL, Bathinda, titled "A STUDY OF SECONDARY STUDENTS ' REACTIONS TOWARDS LOW - COST PHYSICS DEMONSTRATIONS IN A VARIETY OF SITUATIONS WITH AND WITHOUT VIDEO DISPLAY" was published in 1989 in the journal 'Progress of Education' ( Volume 64; Page 247) which was accessed at books.google.co.in › books.
Kishore [2](1989) suggests that physics classroom instruction with special reference to interactive video offers the combination of the audio-visual aids have a great flexibility, however, not more than 25% time should be given to the the modes of instruction other than the face-to=face instruction.
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