Aberrations

What is chromatic aberration?

• A technique for adjusting camera exposure

• A type of color blindness affecting vision

• Chromatic aberration is a type of optical distortion caused by a lens's inability to focus different wavelengths of light at the same point

• A method for enhancing image resolution

What are the effects of astigmatism on image formation?

• Astigmatism leads to blurred or distorted images due to improper focus of light rays.
• Astigmatism causes images to appear brighter and more vivid.
• Astigmatism has no effect on image clarity or focus.
• Astigmatism improves the sharpness of images in low light conditions.

Spherical aberration can also be made minimum by using two_______ lenses

• plano-convex

• plano-concave

• concave

• convex

The paraxial rays passing through the lens close to the axis are refracted less and come to focus _________ from the lens

• behind the lens
• closer to the lens
• at the same distance
• farther away

The aberration that occurs due to dispersion of light are called ________ aberration

• spherical aberration
• coma aberration
• chromatic aberration
• field curvature aberration

The coma can be eliminated if a lens satisfied ________ condition

• Abbe's sine condition

• Newton's law

• Snell's Law

• Gauss law

An achromatic lens ....

• corrects chromatic aberration for light rays of two different wavelengths.

• 
  corrects chromatic aberration for light rays of three or more different wavelengths.

• has coma and distortion corrected.

• 
  partially corrects spherical aberration.

What is the circle of least confusion?

• The circle of least confusion is the point of smallest blur in an optical system.
• The circle of least confusion refers to the area of greatest distortion in an image.
• The circle of least confusion is the point of maximum clarity in an optical system.
• The circle of least confusion is the point where light rays converge to form a perfect image.

What is the primary cause of distortion in lenses?

• The material of the lens is the main factor causing distortion.
• Distortion is mainly caused by the lighting conditions during photography.
• The primary cause of distortion is the type of camera used.
• The primary cause of distortion in lenses is the shape and curvature of the lens elements.