In optical instrument, the lenses are used to form image by the phenomenon of

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Q: 72 (NDA-I/2014)
In optical instrument, the lenses are used to form image by the phenomenon of

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,35,33,24,35,8,1

keywords: 

{'optical instrument': [0, 0, 0, 1], 'lenses': [0, 0, 1, 2], 'refraction': [0, 0, 1, 0], 'reflection': [1, 1, 2, 19], 'image': [0, 1, 3, 23], 'diffusion': [4, 1, 4, 12]}

The correct answer is option 2: refraction.

In optical instruments, lenses are used to form an image by the phenomenon of refraction. Refraction occurs when light passes through a medium, such as a lens, and bends due to the change in speed and direction. This bending of light is responsible for the formation of images in optical instruments.

Reflection, option 1, refers to the bouncing of light off a surface. While reflection is a common phenomenon in optics, it is not the primary process by which lenses form images.

Scattering, option 3, refers to the scattering of light in different directions when it interacts with particles or irregularities in a medium. While scattering can affect the passage of light through a medium, it is not directly involved in the formation of images by lenses.

Diffusion, option 4, refers to the spreading out or dispersion of light as it passes through a material. Diffusion is not the primary mechanism by which lenses form images.

Therefore, the correct answer is option 2: refraction.