MHT CET 2026 Physics question
In a biprism experiment, a steady interference pattern is observed on a screen kept 100 cm from the source, using a light of wavelength 5000 . Without changing the distance between the virtual images of the slit, the source of light is replaced by a source of wavelength 6400 . Now , to reduce the fringe width by 20 %, the screen should be moved
Answer: (A)
Solution
Fringe width with fixed, so . Initially . The required fringe width is 80% of this (a 20% reduction): , so
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