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

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ConceptRefraction of Light - Refraction Through a Rectangular Glass Slab  

Question

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.

Solution

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When rays of light are incident on a glass slab then the incident ray and emergent ray are _________ each other.

  1. perpendicular
  2. parallel
  3. opposite
  4. concurrent
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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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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
I30°19°29°
II40°28°40°
III50°36°50°
IV60°40°59°

The best observation is

(A) I

(B) II

(C) III

(D) IV

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Four students P, Q, R and S traced the path of a ray of light passing through a glass slab for an angle of incidence 40° and measured the angle of refraction. The values as measured them were 18°; 22°; 25° and 30° respectively. The student who has performed the experiment methodically is

(A) P

(B) Q

(C) R

(D) S

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If the speed of light in vacuum is 3 × 108 ms−1, find the speed of light in a medium of absolute refractive index 1.5.

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Solution for concept: Refraction of Light - Refraction Through a Rectangular Glass Slab. For the course 8th-10th CBSE
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