Question

urgent urgent....... ​

Answer 1

Answer:

the answer is [ d= 5.5 ★ 10³ cm

Answer 2

Explanation

bright fringe = n D wavelength / d

where D is distance between slits and screen and d is distance between two slits .

now using formula ,

=> 0.5 = 3 × 120 × wavelength / 0.04

=> wavelength = 0.5 × 0.04 / 360

=> wavelength = 0.020 / 360

=> wavelength =5.5 × 10^-³

so , option D is correct .