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Mirror Formula Based
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Q.1
If a man’s face iscm in front of concave shaving mirror producing erect image 1.5 times the size of face, focal length of the mirror would be:
75 cm
25 cm
15 cm
60 cm
Q.2
A student is 2.away from a convex lens while her image is 1.from the lens, what is the focal length?
1.05m
2.50m
1.39m
0.72m
Q.3
You are given three media A, B and C of refractive index 1.1.and 1.The medium in which the light will travel fastest is
A
B
C
Equal in all media
Q.4
If the power of a lens is – 2 D, what is its focal length?
+50 cm
-100 cm
-50 cm
+100 cm
Q.5
What does The law of reflection state?
the angle the incident ray makes with a line drawn perpendicular to the surface of the mirror.
shows how rays change direction when they strike mirrors and pass through lenses.
The angle of reflection is equal to the angle of incidence.
Q.6
What colour is best to be seen in the dark?
yellow
black
grey
bright green
silver
Q.7
What is reflective in our classroom?
lights
a book bag
computer
Mrs Gaunt
Q.8
Is a tree reflective?
yes
no
sometimes
Q.9
What does translucent mean?
Light can pass through it
No light can pass through it
some light can pass through it
Q.10
What does transparent mean?
Light can pass through it
No light can pass through it
some light can pass through it
Q.11
What does opaque mean?
Light can pass through it
No light can pass through it
some light can pass through it
Q.12
What happens if the light hits a smooth surface?
It scatters
It bounces back
It is absorbed
Q.13
Where does light come from?
sun
light bulb
curtains
windows
fire
Q.14
What do you use to see?
nose
eyes
tongue
hands
Q.15
According to the laws of reflection, if i = angle of incidence and r = angle of reflection,
A. i = r
B. i > r
C. r > i
D. i is not equal to r
Q.16
Law of Reflection states that the incident angle is ____ the reflected angle
greater than
less than
equal to
Q.17
The two types of spherical mirrors are ...............
flat and plane
concave and plane
convex and concave
plane and rectangular
Q.18
In a concave mirror, if an incident ray passes through F and hits the mirror then it will reflect
Towards C
Towards F
Parallel
Away from the mirror
Q.19
An image that forms when light rays actually meet
virtual image
real image
diffuse reflection
regular reflection
Q.20
The phenomenon by which the incident light falling on a surface is sent back into the same medium is known as ________.
polarization
reflection
refraction
absorption
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