Question:

The diffraction pattern of a light of wavelength 400 nm diffracting from a slit of width 0.2 mm is focused on the focal plane of a convex lens of focal
length 100 cm. The width of the 1st secondary maxima will be : 

(1) 2 mm 

(2) 2 cm 

(3) 0.02 mm

(4) 0.2 mm

                                        JEE-2024

Solution:                
The diffraction pattern of a light of wavelength 400 nm diffracting from a slit of width 0.2 mm is focused on the focal plane of a convex lens of focal length 100 cm. The width of the 1st secondary maxima will be : (1) 2 mm (2) 2 cm (3) 0.02 mm (4) 0.2 mm JEE-2024

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