Assertion (A) : In Young’s double slit experiment, the fringes produced by red light are closer as compared to those produced

Question

Given below are two statements. On is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : In Young’s double slit experiment, the fringes produced by red light are closer as compared to those produced by blue light.

Reason (R) : The fringe width is directly proportional to the wavelength of light. In the light of above statements, choose the correct answer from the options given below :

(1) Both (A) and (R) are true and (R) is the correct explanation of (A)

(2) (A) is false but (R) is true.

(3) Both (A) and (R) are true but (R) is NOT the correct explanation of (A).

(4) (A) is true but (R) is false.

Answer 1

Correct option is : (2) (A) is false but (R) is true.

\(\beta=\frac{\lambda \mathrm{D}}{\mathrm{d}} \ \&\ \lambda_{\mathrm{R}}>\lambda_{\mathrm{b}}\)

\( \therefore \beta_{\mathrm{R}}>\beta_{\mathrm{b}}\)