# Solution - Refraction of Light - Refraction Through a Rectangular Glass Slab

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ConceptRefraction of Light - Refraction Through a Rectangular Glass Slab

#### Question

Define refraction and state the laws of refraction.

#### Solution

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Draw a ray diagram to show the refraction of light through a glass slab and mark angle of refraction and the lateral shift suffered by the ray of light while passing through the slab.

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Study the following four experimental set-ups I, II, III and IV for the experiment, "To trace the path of a ray of light through a rectangular glass slab."

Which of the marked set-ups is likely to give best results (P1 and P2 are the positions of pins fixed on the incident ray)?

(A) I

(B) II

(C) III

(D) IV

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A student traces the path of a ray of light through a rectangular glass slab for the different values of angle of incidence. He observes all possible precautions at each step of the experiment. At the end of the experiment, on analyzing the measurements, which of the following conclusions is he likely to draw?

(A) ∠i = ∠e < ∠r

(B) ∠i < ∠e < ∠r

(C) ∠i > ∠e > ∠r

(D) ∠i = ∠e > ∠r

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State the laws of refraction of light. Explain the term absolute refractive index of a medium and write an expression to relate it with the speed of light in vacuum.

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After tracing the path of a ray of light passing through a rectangular glass slab for four different values of the angle of incidence, a student reported his observations in tabular form as given below:

 S.No ∠ i ∠ r ∠ e I 30° 19° 29° II 40° 28° 40° III 50° 36° 50° IV 60° 40° 59°

The best observation is

(A) I

(B) II

(C) III

(D) IV

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Solution for concept: Refraction of Light - Refraction Through a Rectangular Glass Slab. For the course 9th - 10th SSC (English Medium)
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