CBSE Class 10 Science 2019 · Paper 31/2/1 · Question 26(b)

The Human Eye and the Colourful World 2 marks Medium

A student traces the path of a ray of light through a glass prism as shown in the diagram, but leaves it incomplete and unlabelled. Redraw and complete the diagram. Also label on it

∠ i

∠ e

∠ r

and

∠ D

Answer

Join E to F for the refracted ray, draw the normals, and mark $∠ i$ , $∠ r$ , $∠ e$ and $∠ D$ as defined.

Completed diagram (see the figure): join the point E, where the incident ray meets the first face, to the point F, where the emergent ray leaves the second face; EF is the refracted ray inside the prism. Draw the normals to the faces at E and F.

∠ i

(angle of incidence): between the incident ray and the normal at E.

∠ r

(angle of refraction): between the refracted ray EF and the normal at E, inside the prism.

∠ e

(angle of emergence): between the emergent ray and the normal at F.

∠ D

(angle of deviation): between the incident ray produced forward and the emergent ray produced backward, where the two meet.

🔒 Step-by-step solution

CBSE Class 10 Science 2019 · Paper 31/2/1 · Question 26(b)

Answer

From the board papers

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