Question

A: Fresnel diffraction occurs when the source of light or the screen or both are at a finite distance from the diffracting device
B: Diffracted light can be used to estimate the helical structure of nuclic acids

• A. A is true, B is false
• B. Both A and B are true
• C. A is false, B is true
• D. Both A and B are false

Answer 1

The correct option is A A is true, B is false

Fresnel diffraction is a near field effect in which the screen is at a finite distance
from the diffracting device. Polarised light is used to estimate helical structure
of nuclic acids.