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Senior High School: 11th and 12th Grade
Physics
Light - Lenses 2
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Q.1
The power of a lens (SI system) can be calculated using which of the following formulae?
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Power = 1 / focal length (in m)
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Power = focal length / 1
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Power = 1 / focal length (in cm)
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Focal length (m) = 1 / Power2
Q.2
In the eye, which of the following parts does light NOT travel through?
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The pupil
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The lens
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The cornea
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The iris
Q.3
A lens which focuses light to a point is called a what?
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A converging lens
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A diverging lens
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A meniscus lens
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A biconvex lens
Q.4
What is the unit of power for a lens?
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Watt
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Joule
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Dioptre
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Metre
Q.5
What part of the eye focuses the light?
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The lens
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The iris
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Suspensory ligament
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Retina
Q.6
What is chromatic aberration?
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Where light is split into constituent colors as it travels through a lens
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Separate rays of colored light are converged into one beam of chromatic light
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Where chromatic light is split into two colors after traveling through a lens
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Chromatic aberration does not affect light
Q.7
What is the focal length of a lens which has a power of 0.5?
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2 cm
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2 m
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0.2 m
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0.5 m
Q.8
What is the power of a lens dependent on?
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The type of wave incident on the lens
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The focal length of the lens
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The time of day
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The way the lens is being held
Q.9
What is the power of lens which has a focal point of 20 cm?
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0.05
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0.5
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5
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50
Q.10
Calculate the power of a converging lens of focal length 0.05 m.
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20
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-20
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-2
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2
0 h : 0 m : 1 s
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