An optical arrangement , comprising: - a first optical element in the form of or comprising a light guide obliquely bevelled to have a bevel face ; and - a second optical element ; wherein the first optical element - conducts light by total internal reflection at the wall thereof; and - has a light entry area defined by the non-bevelled end face of the light guide ; and - has a light exit area , wherein the light exit area is defined by a surface area of the wall at that end of the light guide at which the bevel face is provided; wherein - the second optical element has a light entry aperture , which is arranged on the light exit area of the first optical element or faces the light exit area of the first optical element ; - the shape of the light entry aperture of the second optical element has an aspect ratio from 0.8:1 to 1.2:1, preferably from 0.9:1 to 1.1:1, most preferably of 1:1 for two mutually perpendicular directions; and - the depth y_G of the light entry area of the first optical element and the depth y2 of the light entry aperture of the second optical element define a ratio y_G/y2 which is in a range from 0.85 to 1.15, preferably in a range from 0.9 to 1.11; characterised in that - the light entry area of the first optical element has a width x measured in the direction along the intersection of the light entry area with the plane of light deflection at the bevel face and - the light entry aperture of the second optical element has a height z measured in the direction along the intersection of the light exit area of the first optical element with the plane of light deflection at the bevel face , which width x and height z meet the following relationship: x / z ≤ 1.5 ⋅ tan 90 ° − α / 2 − tan 90 ° − 2 ⋅ α / 2 + 90 ° − 180 ° − arcsin 1 / n − 1 , wherein α denotes the deflection angle of the light at the bevel face and n denotes the refractive index of the material of the first optical element . - a first optical element in the form of or comprising a light guide obliquely bevelled to have a bevel face ; and - a second optical element ; wherein the first optical element - conducts light by total internal reflection at the wall thereof; and - has a light entry area defined by the non-bevelled end face of the light guide ; and - has a light exit area , wherein the light exit area is defined by a surface area of the wall at that end of the light guide at which the bevel face is provided; wherein - the second optical element has a light entry aperture , which is arranged on the light exit area of the first optical element or faces the light exit area of the first optical element ; - the shape of the light entry aperture of the second optical element has an aspect ratio from 0.8:1 to 1.2:1, preferably from 0.9:1 to 1.1:1, most preferably of 1:1 for two mutually perpendicular directions; and - the depth y_G of the light entry area of the first optical element and the depth y2 of the light entry aperture of the second optical element define a ratio y_G/y2 which is in a range from 0.85 to 1.15, preferably in a range from 0.9 to 1.11; characterised in that - the light entry area of the first optical element has a width x measured in the direction along the intersection of the light entry area with the plane of light deflection at the bevel face and - the light entry aperture of the second optical element has a height z measured in the direction along the intersection of the light exit area of the first optical element with the plane of light deflection at the bevel face , which width x and height z meet the following relationship: x / z ≤ 1.5 ⋅ tan 90 ° − α / 2 − tan 90 ° − 2 ⋅ α / 2 + 90 ° − 180 ° − arcsin 1 / n − 1 , wherein α denotes the deflection angle of the light at the bevel face and n denotes the refractive index of the material of the first optical element . <EOS>