1.

A double-slit apparatus is set up and green light is used to form the interference pattern. The green light is then replaced by red light. Which of the following changes may allow the spacing of the bright bands on the screen to between to remain unaffected by the of light color ? (Given that the distance between the slits is d and that between the plane of the slite and the screen is D.)

Answer»

Decrease D
Increase d
Increase d and decrease D
Increase the brightness of the LIGHTNESS of the LIGHT source

Solution :Fringe width `beta=(Dlamda)/(d)`
`lamda` increases so to KEEP `brta` UNCHANGED either 'D' decreases or 'd' increases of both


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