Olympiad – Class X – Science - Phy - Light, Reflection and Refraction

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Question - 1

Observe the given figure

What is the angle of reflection?

  • A 20°
  • B 40°
  • C 70°
  • D 90°

Question - 2

An object a is placed in front of a plane mirror as shown below.

At which point is the image of the object 'O' formed?

  • A P
  • B Q
  • C R
  • D S

Question - 3

A ray of light travels from water to air as shown below.

Given that the refractive index of air is 1.0 and the refractive index of water is 1.3, what is the angle of incidence?

  • A 22.6°
  • B 23.1°
  • C 39.0°
  • D 40.5o

Question - 4

The radius of curvature of a spherical mirror is 30 cm. What is its focal length?

  • A 10 cm
  • B 15 cm
  • C 20 cm
  • D 25 cm

Question - 5

A ray of light travels from air to glass as shown below.

Given that the refractive index of air is 1.0 and the refractive index of glass is 1.5, what is the angle of refraction?

  • A 22.6°
  • B 30.8°
  • C 35.3°
  • D 40.0°

Question - 6

Which of the following correctly represents the incident ray, the refracted ray and the emergent ray in the given glass slab?

  • A Incident ray  Refracted ray Emergent ray PQ QR RS
  • B Incident ray Refracted ray Emergent ray PQ RS QR
  • C Incident ray Refracted ray Emergent ray RS QR PQ
  • D Incident ray Refracted ray Emergent ray RS PQ QR

Question - 7

A ray of light travels from water to air as shown below.

Given that the refractive index of air is 1.0, what is the refractive index of glass?

 

  • A 1.2
  • B 1.3
  • C 1.4
  • D 1.5

Question - 8

A light ray travels through three media as shown below.

Which of the following shows the ascending order of their refractive indices?

  • A Medium 1, medium 2, medium 3
  • B Medium 2, medium 3, medium 1
  • C Medium 3, medium 1, medium 2
  • D Medium 1, medium 3, medium 2

Question - 9

Which of the following correctly shows how a light ray travels through a thick converging lens?

 

  • A P
  • B S
  • C Q
  • D R

Question - 10

Which of the emergent rays shown in the figure is the correct one, when an incident ray strikes a diverging lens?

  • A P
  • B S
  • C R
  • D Q