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Total questions: 22
Worksheet time: 11mins
The ray diagram shows the image of an object formed by a converging lens. What is the focal length of the lens?
40 cm
50 cm
72 cm
90 cm
The diagram shows the dispersion of white light by a prism. Which row could be correct for the colours seen at X, at Y and at Z?
red, violet, yellow
red, yellow, violet
violet, yellow, red
yellow, red, violet
The diagram shows an object in front of a plane mirror. At which labelled position is the image of the object formed?
A
B
C
D
Which diagram correctly shows a ray of light reflected by a plane mirror?
The diagram shows a ray of light incident on the edge of a piece of glass. The angle i is greater than the critical angle. Which arrow shows the direction of the ray after it leaves the edge of the glass?
A
B
C
D
The diagram shows a ray of light inside a glass rod. The critical angle for the light in the glass is 42°. Which row shows what happens to the light when it reaches the surface of the glass rod?
Reflected: NO; Refracted: NO
Reflected: NO; Refracted: YES
Reflected: YES; Refracted: NO
Reflected: YES; Refracted: YES
A plane mirror is fitted to a wall. Which statement about the image formed by the mirror is correct?
The image is real.
The image is left to right (laterally inverted).
The image is smaller than the object.
The image is upside down.
Water waves may be used to demonstrate refraction by making them pass into water of a different depth. Why does the water wave change direction as it passes into the shallow water?
The frequency of the wave decreases.
The frequency of the wave increases.
The speed of the wave decreases.
The speed of the wave increases.
A teacher demonstrates the dispersion of white light using a triangular glass prism. Which diagram shows how this dispersion happens?
A thin converging lens is used to produce, on a screen, a focused image of a candle. Various focused images are produced on the screen by moving the lens and the screen backwards and forwards. Which statement is always correct?
The image is at the principal focus (focal point) of the lens.
The image is bigger than the object.
The image is closer to the lens than the object is.
The image is inverted.
The figure shows two rays of monochromatic light, one entering the prism along the normal DE and the second one along PQ. The refractive index of the glass of the prism is 1.49. The ray EF is refracted at F. Use information from to calculate the angle of refraction at F.
40
48.2
90
30
The ray of blue light passes from air into a glass block. The figure shows the ray making an angle of 35° with the side of the block. Glass has a refractive index of 1.5. Calculate the angle of refraction of the light in the glass
0.54610
50
33
0.5
The speed of light in an optical fibre is 2×108 m / s. For light in the material from which the optical fibre is made, calculate the critical angle.
12
55
0
42
Which diagram best represents the behavior of a ray of monochromatic light in air incident on a block of crown glass (1.52)?
The law of reflection says that
the angle of reflection from a mirror equals the angle of incidence.
waves incident on a mirror are partially reflected.
all waves incident on a mirror are reflected.
the angle a ray is reflected from a mirror is random.
It is difficult to see the roadway from a car on a rainy night because the road surface
is obscured by the rain itself.
that is normally a diffuse reflector when dry becomes a mirror surface when wet.
absorbs the light more when wet.
scatters light in all directions.
Refraction is caused by
different wave speeds.
more than one reflection.
displaced images.
bending.
A beam of light emerges from water into air at an angle. The beam is bent
away from the normal
not at all
48 degrees upward
96 degrees upward
towards the normal
The effect that we call a mirage has most to do with
reflection
refraction
diffraction
interference
scattering
In a curved optical fiber, light
gains energy in each internal reflection.
internally reflects in a succession of straight-line paths.
bends and follows the curve of the fiber.
scatters in random directions from the fiber's inner surface.
A beam of light travels fastest in
air
water
plastic
glass
Its average speed is the same in each of the above
The spectrum produced by a prism or a raindrop is evidence that the average speed of light in the material depends on the light's...
transmission qualities
color
wave nature
particle nature
