In these diagrams, the angle of refraction r has been correctly marked in which diagram?

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III

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Solution

The correct option is D
IV

The angle of refraction is the angle of the refracted ray with the normal.

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Q. Which structure out of I, II, III and IV marked in the given diagram of the epidermal peel of leaf should be labelled as stoma?

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After tracing the path of a ray of light through a glass prism a student marked the angle of incidence ( $∠$ i), angle of refraction ( $∠$ r) angle of emergence ( $∠$ e) and the angle of deviation ( $∠$ D) as shown in the diagram. The correctly marked angles are: