# Questions tagged [geometric-optics]

The subfield of optics in which light propagation is approximated in terms of rays. It mainly includes reflection and refraction on surfaces.

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### Derivation for the formula of number of images formed by two inclined mirrors [closed]

I just can't memorize the formula without its clear derivation!! It would really help if someone derived it clearly!! The i have listed the formula and they are correct too, but without its proof! Its ...
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### How do objects across a flat surface appear distorted?

Imagine looking at an object after a planar interface. It can be proven that if angles are small, $y'=y\frac{n_1}{n_2}$. Steps are easy but this result confuses me and I'm not sure to have understood ...
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### Specular and diffuse reflection at the same time

if we know that tomatoes absorb all the light and reflect the red diffusely, how can we see the reflection of all the light specularly at the shinnig point? there isnt an absorption of other colors at ...
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### Phase difference and path difference relation confusion

If two light waves of same wavelength reaches the point $P$, then what is the relationship between path difference and phase difference? In many books I have seen that they assume two 1-D equation ...
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### What is the minimum size of an object to cast a shadow on the entire Earth?

When I fly up(don't ask me how), I see how my Sun's shadow on Earth is getting bigger but dimmer as the Sun's light is reflected from other objects. As I flew higher and higher in the direction of the ...
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1 vote
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### General criteria for whether or not a mirror will form images

The most general form of a mirror in one dimension is a differentiable function $f:\mathbb R \rightarrow \mathbb R$, for which $f(x)$ determines the vertical position of the mirror at displacement $x$ ...
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