The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in Figure 10.5. Which one of them is correct?

fig 10.5.jpg

(a) A

(b) B

(c) C

(d) D

 

Answer

Refraction of light through a glass slab takes place as shown in the figure:

refraction-through-a-rectangular-glass-slab---teachoo.jpg

Now, let’s check all 4 options - 

  • For A - Light doesn’t bend when light passes from air to glass, and it also doesn’t bend when light passes from glass to air. So, A is not true

  • For B - Light bends towards the normal when light passes from air to glass, and it bends away from normal when light passes from glass to air. So, B is the correct answer

  • For C - Light doesn’t bend when light passes from air to glass. So, C is not true

  • For D - Light bends towards the normal when light passes from air to glass but it doesn’t bend when light passes from glass to air. So, D is not true


So, the correct answer is (b)

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo