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Standard IX
Physics
Question

If a ray of light goes from a rarer medium to a denser medium , will it bend towards the normal or away from it ?
  1. bends away from the normal
  2. bends towards the normal
  3. is reflected back
  4. goes undeviated

A
is reflected back
B
bends towards the normal
C
bends away from the normal
D
goes undeviated
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Solution
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Refraction is the bending of light rays after entering a medium where its speed is different. Due to refraction of light, when a ray of light passes from a rarer medium to a denser medium, bends towards the normal to the boundary between the two media. The amount of bending depends on the indices of refraction of the two media. Hence, when a ray of light from air enters a denser medium, it bends towards the normal.

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Q1

If a ray of light goes from a denser medium to a rarer medium, will it bend towards the normal or away from the normal ?

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Q2

When a ray of light from air enters a denser medium, it :

(a) bends away from the normal

(b) bends towards the normal

(c) goes undeviated

(d) is reflected back.

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Q3
When light travels from an optically rarer medium to a denser medium,
(a) it bends away from the normal.
(b) it bends towards the normal.
(c) it remains undeviated.
(d) it is laterally displaced.
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Q4
When a light ray passes from a denser to a rarer medium, it bends towards the normal.
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Q5
A ray of light goes from water into air. Will it bend towards the normal or away from the normal?
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