REFRACTION OF LIGHT AT PLANCE SURFACES

When does the light is refracted?

• When light travels in a straight line

• When light is bounced

• When light travels in two different mediums

• When light cannot pass through an opaque object

What direction does the ray bend when entering a more optically dense material, where the wave travels more slowly?

• Towards the normal.

• Away from the normal.

• No change.

• Answer is not listed above.

A ray of light in air is incident at an angle on one side of a rectangular glass block, as shown. Which ray diagram correctly describes the complete path of the ray of light?

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Absolute refractive index of any medium is always _______.

• less than 1
• greater than 1
• 1
• 0

The velocity of light in vacuum is _______ m/s.

• 3x10⁸
• 3x10¹²
• 3x10⁶
• 3x10¹⁰

The formula to calculate the refractive index is

(c = speed in vacuum, v = speed in medium)

• n=cv

• n=v/c

• n=c/v

• v=nc

Which are NOT correct for total internal reflection to take place

• 1.The incident angle should be less than the critical angle

• 2.The incident angle should be greater than the critical angle

• 3.Light should travel from a rarer to a denser medium

• 4.both 1 and 3

^{What is the refractive index of a fibre optic pipe, if the critical angle is 30 degree?}

• 2.0

• 1.7

• 2.4

• 0.5

A ray of light travels from glass to air with an angle of incidence of 35^o. If the critical angle is 42^o, what will happen at the glass airinterface?

• refraction take place

• total internal reflection

• light travels along the boundary

• reflectiontakes place

Net deviation produced by the glass slab

• 0⁰

• 90⁰

• 45⁰

• depends on the angle of incidence