Quiz 14 ; Refraction of Light at Plane Surfaces : Part 2

Refractive index of water is ...................

• 1.0003

• 1.31

• 1.33

• 1.44

The net deviation produced by a rectangular glass slab is .....................

• equal to angle of incidence

• greater than angle of incidence

• less than angle of incidence

• zero always

Refractive index of a medium is  $\sqrt{2}$  , then its critical angle is ................. 

•  $22^0$  

•  $45^0$  

•  $60^0$  

•  $15^0$  

Refractive index of glass is 3/2. Then the speed of light in glass is ..................

• 3 x 10⁸ m/s

• 2 x 10⁷ m/s

• 3 x 10⁶ m/s

• 2 x 10⁸ m/s

When angle of incidence is equal to critical angle, angle of refraction is equal to ......................

• 0⁰

• 90⁰

• 45⁰

• 30⁰

The basic cause of refraction is ......................

• When light is incident on a boundary

• When refractive indices of two media are equal

• Change in the speed of light is going from one medium to another

• When refractive indices of two media are not equal

Mirages are .....................

• virtual image

• real image

• virtual image of the sky

• secret of nature

Optical fibres work on ...................

• Reflection

• Refraction

• Total internal reflection

• Multiple reflections

..................... is used to examine the inner parts of nose, stomach by doctors.

• Stethoscope

• Endoscope

• Kaledioscope

• Microscope

Twinkling of stars is due to .................

• Total internal reflection

• Dispersion

• Scattering

• Atmospheric refraction