Question

a point is situated at 6.5 cm and 6.65 cm from two coherent sources .find the nature of illumination at tha point if wavelength of light is 5000°A.​

Answer 1

Path difference =0.15cm=15×10

−4

m

Wavelength =5000A=5×10

−7

m

If path difference = n × wavelength , then it will be a point of constructive interference where n is Natural number.

Here , the n=

(5×10

−7

)

(15×10

−4

)

=3000 is natural number

Hence the point will undergo constructive interference and will be bright.