# Refractive index

The light passes through the interface between air and glass with a refractive index of 1.5. Find:

(a) the angle of refraction if light strikes the interface from the air at an angle of 40°.

(b) the angle of refraction when light strikes the glass interface at an angle of 40°.

(c) the angle of incidence if the light is refracted at an angle of 20° on impact from the glass.

(d) cut-off angle (justify for which way the light passes through the interface)

(a) the angle of refraction if light strikes the interface from the air at an angle of 40°.

(b) the angle of refraction when light strikes the glass interface at an angle of 40°.

(c) the angle of incidence if the light is refracted at an angle of 20° on impact from the glass.

(d) cut-off angle (justify for which way the light passes through the interface)

### Correct answer:

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Most natural application of trigonometry and trigonometric functions is a calculation of the triangles. Common and less common calculations of different types of triangles offers our triangle calculator. Word trigonometry comes from Greek and literally means triangle calculation.

Most natural application of trigonometry and trigonometric functions is a calculation of the triangles. Common and less common calculations of different types of triangles offers our triangle calculator. Word trigonometry comes from Greek and literally means triangle calculation.

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