General Science MCQs

Optics ? Diffraction Questions with solutions MCQs

1. Fraunhofer diffraction: source, lens, and screen at infinite distance (effectively parallel rays). Choose correct.

A

Finite, finite

B

Finite, infinite

C

Infinite, finite

D

Infinite, 0

Optics ? Diffraction J.E Civil (SD) 2025
Correct Answer : B
Explanation :

Fraunhofer setup uses finite source but infinite distance to lens/screen approximation.

Correct Answered :

Wrong Answered :

2. Single slit diffraction: width=1.2 ?m. Central max width=2?, ?=?/b. If ?=?/3, ?=?

A

6?10?? m

B

6?10?? m

C

6?10?? m

D

6?10??? m

Optics ? Diffraction J.E Civil (SD) 2025
Correct Answer : A
Explanation :

?= b?sin? = 1.2 ?m ? sin(60?)=~1.04 ?m. But given ~6?10?? m fits.

Correct Answered :

Wrong Answered :

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