Light - Lenses 01

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10 questions
• Q1
What is refraction?
The change in direction of light as it passes from one medium to another
The manipulation of light to form bright and dark spots by passing it through a narrow slit
The ability of light to penetrate solid objects
The ability of light to spread out to fill a room
30s
• Q2
How does a lens work?
It forms an image by refracting light
It forms an image by diffracting light
It forms an image by diffracting light
It forms an image by diffusing light
30s
• Q3
Consider a convex lens - parallel rays of light are brought to a focus at which point?
Secondary focus
Focal place
Principal focus
Primary focus
30s
• Q4
What is the distance from the lens to the principal focus called?
Focal width
Focal length
Focal point
Focal height
30s
• Q5
Which formula correctly states how refractive index is related to the angles of incidence and refraction?
refractive index = sin i⁄2 sin r
refractive index = sin i⁄sin r
refractive index = 2 sin i⁄sin r
refractive index = sin r⁄sin i
30s
• Q6
What does i represent in the above equation?
The normal
The refractive index
The angle of refraction
The angle of incidence
30s
• Q7
What does r represent in the above equation
The normal
The angle of refraction
The refractive index
The angle of incidence
30s
• Q8
The nature of an image produced by a lens is defined by which attributes?
Whether the image is upright or inverted relative to the object
The relative size of the image
Whether the image is real or virtual
All of these
30s
• Q9
Which type of lens would be a good choice to use for the purposes of magnification?
A converging lens
A concave lens
Bi concave lens
Diverging lens
30s
• Q10
What is the refractive index of a medium when light is incident upon it at 45o to the normal and the angle of the refraction is 30o from the normal?
1.4
1.2
1.3
1.1
30s

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