Questions · Page 2 of 2

[2 Mark Questions]

Question 512 Marks
What are the characteristics of the image formed on a plane mirror?
Answer
    • Image is upright.
    • Size of the image is the same as the size of the object.
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Question 522 Marks
List down the uses of concave mirror.
Answer
  • Concave mirrors are used :

    • As Shaving mirror.
    • As Reflectors in automobile headlights & torches.
    • By dentists to see large images of the teeth of patients.
    • To produce heat in solar furnaces.
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Question 532 Marks
A ray of light traveling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
Answer
  • When a ray of light travels from air into water obliquely, it bends towards the normal.
  • This is because water is optically denser than air.
  • On entering water, speed of light decreases and the light bends towards normal.
  •  
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Question 542 Marks
Under what circumstances there won’t be any refraction of light when it enters from one medium to another?
Answer
  • When light incident at 90°, it will not bend.
  • When light passes from denser medium to rarer medium and if it is incident at an angle greater than the critical angle, it will reflect but will not refract.
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Question 552 Marks
Two medium with refractive index 1.31 & 1.50 is given. In which case (i) Bending of light is more and (ii) speed of light is more.
Answer
(i) 1.50 – Bending is more
(ii) 1.31 – Speed is more
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Question 562 Marks
Which is optically denser out of the two medium M1& M2 having the refractive indices = 1.71 and 1.36 respectively?
Answer
M1 Reason: Optical density increases as the value of the refractive index increases.
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[2 Mark Questions] - Page 2 - Science STD 9 Questions - Vidyadip