Question

Q1:In Young's double-slit experiment using blue light, the interference patterm consists of ? A) a central white band with molti-colored bands on either side B) a central dark band with alternating bright and dark bands on either side C) a central dark band with multi-colored bands on either side D) a central bright band with altemating dark and bright bands on either side Q2:When sunlight falls on an oily film spread on a water puddle, a spectrum of colors is observed. The colors are a result of the ? A) refraction of light by the oily film B)constructive and destructive interference of light waves reflected by the oly film C) absorption of light by the oily film D)absorption of colors in a pigment present in the oly film

Answer 1

1). When we use blue light in young double slit experiment a central bright band with alternating dark and bright bands on either side is produced. This is because as blue light is a monochromatic light which produced bright fringe at centre kniwn as central bright fringe and then dark fringe on both sides,then again bright fringe on either side and this goes on alternatively. Ans=>D

2). Spectrum color observed when sunlight falls on a oily film because reflected light from the different place of the film cause interference which produced bright and dark spectrum. Ans=>V