New post in Geometric-optics

Magnification of a real image formed by a concave lens

December 16th, 2022

Why do things that are far away seem smaller?

March 8th, 2020

Do all light rays from a point passing through a thin lens converge at the image?

November 10th, 2020

Infinite total internal reflection

January 30th, 2020

Proof that all rays parallel to the principal axis meet at the focus during reflection from a concave mirror

August 1st, 2022

Can you shake your reflection's hand?

July 16th, 2020

Fresnel distance and Geometrical limit

December 27th, 2020

How does this mirror NOT flip its image?

October 14th, 2020

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

July 10th, 2020

Is it possible to make glasses that make everything brighter, but do not magnify or focus?

August 1st, 2022

Fermat's principle to prove the law of reflection

February 23rd, 2020

What is the physical meaning of magnifying power of a telescope?

August 1st, 2022

If I reflect light from a projector using a mirror, then is the reflected image real or virtual?

December 29th, 2020

Why we take objective of short focal length and eye piece of long focal length in a compound microscope?

March 17th, 2021

Examples in which the light maximizes the optical path length

November 30th, 2020

Why is there a clear mirror image off a rough surface at shallow angles?

June 19th, 2020

Difference between convexo-concave and concavo-convex lenses?

January 24th, 2020

Software for geometrical optics

May 26th, 2021

Where does the "water" come from in a mirage?

February 14th, 2022

Snell's law in vector form

August 1st, 2022

Calculating light's lateral shift in a glass slab

January 13th, 2022

If diverging rays never meet, why do parallel rays meet at infinity?

January 6th, 2022

What determines the sharpness of a shadow?

September 26th, 2020

How many times can light revolve around a black hole?

March 11th, 2020

Why Does Passing Light Through a Slit Make it Coherent?

May 9th, 2020

How do a microscope's optics expose defects in the user's vision?

January 13th, 2021

Why does a pinhole create an image of the Sun?

March 23rd, 2020

Can one determine the speed of the rain from the shape of the rainbow?

September 4th, 2020

Is it possible to focus the radiation from a black body to make something hotter than that black body?

September 10th, 2020

What is this blue thing in a photograph of a bright light?

August 1st, 2022