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Worksheets941 Refraction of light at plane surfaces
Total questions: 13
Worksheet time: 8mins
Name
Class
Date
1.
"Light ray's always travel between two points in a path which needs the shortest possible time to cover" : This is_______
a)
Fermi principle
b)
Fermat's principle
2.
When a thick glass slab is placed over some printed letters, the letters appear __________ when viewed through the glass slab.
a)
Raised
b)
Lowered
3.
The process of changing speed at the interface when light travels from one medium to another resulting in a change in the direction of light is called __________
a)
Refraction
b)
Reflection
4.
During refraction change in direction of light is due to change in the __________of light in the medium
a)
Speed
b)
Frequency
5.
Lights travels in vacuum with a speed nearly equal to ___________(denoted by letter 'c')
a)
3 ×10 8 m/s
b)
343.2 m/s
6.
What causes light to appear refracted?
a)
temperature
b)
speed
c)
weather
d)
climate
7.
What is this called?
a)
refraction
b)
reflection
c)
reconstroction
d)
retraction
8.
Absolute refractive index of any medium is always _______.
a)
less than 1
b)
greater than 1
c)
1
d)
0
9.
Glass has a _____________ index of refraction than air.
a)
Equal
b)
Greater
c)
Less
d)
Impossible to say
10.
Light changes speed as it travels through various mediums. What are examples of mediums that light can travel through.
a)
snow and ice
b)
air and water
c)
cloth and wood
d)
glass and wood
11.
Light has the lowest velocity in which medium?
flint glass n=1.70
barium glass n=1.60
crown glass n=1.523
water n=1.33
diamond n=2.45
flint glass n=1.70
barium glass n=1.60
crown glass n=1.523
water n=1.33
diamond n=2.45
a)
diamond
b)
water
c)
flint glass
d)
barium glass
12.
Critical angle is the angle of incidence that produces an angle of refraction at......
a)
180 degrees
b)
90 degrees
c)
20 degrees
d)
120 degrees
13.
Critical angle is the angle of incidence that produces an angle of refraction at......
a)
180 degrees
b)
90 degrees
c)
20 degrees
d)
120 degrees
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