New post in Lenses

Magnification of a real image formed by a concave lens

December 16th, 2022

Can focal length of convex lens be negative?

May 26th, 2020

Paraxial rays and marginal rays question

November 23rd, 2020

Glass that only allows light of specific amplitude to pass through it

March 4th, 2020

How is focal length defined for a two-lens system, separated by a distance $d$?

July 10th, 2020

Can spectacles converge sunlight to an extent that it burns the eyeball?

August 1st, 2022

Why can't incoherent light be collimated as well as laser light (e.g. in a laser pointer)?

April 28th, 2020

How do I find the right lens for my laser?

January 30th, 2020

Sign convention in optics

August 1st, 2022

Difference between convexo-concave and concavo-convex lenses?

January 24th, 2020

Does 'focal length' mean something different with lenses and pinhole cameras?

August 1st, 2022

What causes blurriness in an optical system?

March 12th, 2020

Why do convex lenses not disperse light like prisms, given that entry and exit points aren't parallel?

November 20th, 2021

Are Fresnel lenses widely used for solar electricity? If not, why not?

February 16th, 2020

Put a sensor at the focal length, behind, or in front?

August 1st, 2022

Why does wet skin sunburn faster?

September 18th, 2020

How does a telescope make an image larger by shrinking it?

April 2nd, 2020

What are these rays that appear in photograph of sun?

September 9th, 2020

Virtual vs Real image

April 29th, 2021

Why are the edges of the shadow so bright?

August 1st, 2022

How is a (rifle scope) reticle in focus?

July 3rd, 2020

Are quantum effects significant in lens design?

April 25th, 2020

If a lens focuses all incoming light to a point, how do we get 2D images?

June 27th, 2020

Do people wearing glasses have different field of view than those who don't?

January 14th, 2020

Why can you see virtual images?

April 6th, 2020

Why do nearsighted people see better with their glasses *rotated*?

April 19th, 2020

What is the "tangential" distortion of OpenCV actually tangential to?

August 1st, 2022

What can we deduce by the fact that mirrors cannot get a ray hotter than Sun's surface?

January 7th, 2020

Why doesn't a light ray bend again when emerging from a lens?

August 15th, 2021

How to calculate the diameter of a thin lense?

August 1st, 2022