K.C.S.E Physics Q & A - MODEL 2006PP2QN18
​Figure 8 shows an object placed in front of a concave mirror of focal length 10cm. C is the centre of curvature
​(i) On the same figure draw a ray diagram showing the location of the image
Use the ray diagram drawn in (i) above to determine the (ii) Image distance (iii) Magnification (b) A vertical object is placed 20cm in front of a convex lens of focal length 5 cm (i) Determine I. The image distance II. The magnification (ii) State two characteristics of the image
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K.C.S.E Physics Q & A - MODEL 2006PP2QN07
​Figure 5 shows wave fronts approaching a concave surface
Complete the diagram to show the wave fronts formed after striking the surface. Show how the focal point of the surface is located
K.C.S.E Physics Q & A - MODEL 2006PP2QN02
​In a certain pinhole camera, the screen is 10cm from the pinhole. When the camera is placed 6m away from a tree, a sharp image of the tree 16cm high is formed on the screen. Determine the height of the tree.
K.C.S.E Physics Q & A - MODEL 2005PP1QN30
​An illuminated vertical object is initially placed on the principal axis of a converging lens and 32cm from it. The focal length of the lens 15cm. The object is new placed at a point 12cm from the lens and on the same side. State two changes other than magnification than magnification that that are observed on the image formed due to this change.
ANSWER
K.C.S.E Physics Q & A - MODEL 2005PP1QN22
​ Fig. 12 shows a vertical object, O, placed in front of a convex mirror.
On the same diagram draw the appropriate rays and locate the image formed
K.C.S.E Physics Q & A - MODEL 2004PP1QN31
A vertical object is placed at the focal point F of a diverging lens as shown in Figure 16.
​Sketch a ray diagram to show the image of the object.
K.C.S.E Physics Q & A - MODEL 2004PP1QN23
​Figure 12 shows a parabolic surface with a source of light placed at its focal point F
​Draw rays to show reflection from the surface when rays from the source strike the surface at points ABC and D.
K.C.S.E Physics Q & A - MODEL 2003PP2QN07
a) Fig. 8. shows an experimental set up consisting of a mounted lens. L, a screen, s, a meter rule and a candle.
​(i) Describe how the set-up may be used to determine the focal length, f, of the lens.
(ii) State the reason why the set-up would not work if the lens were replaced with a diverging lens. (b) The graph in figure 9. shows the relationship between 1/r and 1/v for converging lens where u and v are the object and image distances respectively.
​For the graph, determine the focal length, f of lens.
(c) An object placed 15cm from a convex lens is magnified two times. Determine the focal length of the lens. K.C.S.E Physics Q & A - MODEL 2003PP1QN29
​Figure 16 (a) and (b) show a convex mirror and a plane mirror of equal aperture.
By sketching a pair of incident and reflected rays for each (a) and (b) show how the convex mirror provides to the eye, a wider field of view than the plane mirror.
K.C.S.E Physics Q & A - MODEL 2003PP1QN16
Figure 10 (draw to scale) shows an image I formed by a diverging lens, L.
​On the same diagram, draw appropriate rays to locate the position of object. Determine the object distance.
K.C.S.E Physics Q & A - MODEL 2002PP1QN28
​Fig. 13 represents an object O placed 10cm in front of a diverging lens is the focal point of the lens.
Draw rays to locate the position of the image. Determine the image distance.
K.C.S.E Physics Q & A - MODEL 2001PP1QN30
​Fig 21 shows a converging lens whose local point F is marked.
​An object is placed in front of the lens such that the lens forms a real magnified image.
Sketch on the same diagram array diagram to represent this. K.C.S.E Physics Q & A - MODEL 2001PP1QN20
​Fig. 13 shows a point object O placed in front of a concave mirror.
Draw appropriate rays to locate the image of the object. K.C.S.E Physics Q & A - MODEL 2001PP1QN08
​Fig. 6 shows an object O being viewed using tow inclined mirrors M1 and M2.
Complete the diagram by sketching rays to show the position of the image as seen by the eye E. K.C.S.E Physics Q & A - MODEL 2000PP2QN01
​a) i) State one application of each of the following.
Convex mirror- Parabolic mirror ii) Fig. 1, which is drawn to a scale of 1:5, represents an object O and its image 'I' formed by a concave mirror.
By drawing suitable rays, locate and mark on the figure the position of the principal focus 'F' of the mirror. Determine the focal length f.
b) The graph in Fig. 2 shows the variation of magnification, M with image distance, V for a concave mirror.
Determine:
i) The object position when the image position is 45cm ii) The focal length of the mirror. K.C.S.E Physics Q & A - MODEL 2000PP1QN31
​Fig (19) drawn to scale) shows the image, I, formed by a diverging lens. F is principal focus of the lens.
By drawing the appropriate rays on the same diagram, locate the position of the object.
K.C.S.E Physics Q & A - MODEL 2000PP1QN23
​Fig. 12 shows a ray of light incident on a convex mirror
​Using a suitable construction on the same diagram determine the radius of curvature of the mirror
K.C.S.E Physics Q & A - MODEL 2000PP1QN09
​ Fig. 5 shows an object O placed infront of a plane mirror.
​On the same diagram draw rays to locate the position of the image I, as seen from the eye E.
K.C.S.E Physics Q & A - MODEL 1999PP2QN02
a) An object O placed in front of a converging lens Lo forms an image 1 on the other side of the lens. Another converging lens Lc placed such that the two lenses form a compound microscope.
i) Draw a reason of the set up and sketch the rays to show how the final image is formed. ii) Give a reason why the focal length of Lo must be greater than that of Lc b) An object is placed 30cm from a converging lens. A focused image is formed on a screen placed 30cm from the same lens on the other side. The screen in now moved 5cm towards the lens. Determine the distance the object must be moved so that a focused image is formed on the screen.
answer
K.C.S.E Physics Q & A - MODEL 1999PP1QN32
Sketch a diagram to show the position of an object, when a converging lens is used as an magnifying glass.K.C.S.E Physics Q & A - MODEL 1999PP1QN08
Figure 6 shows a ray of light incident on plane mirror at point O.
The mirror is rotated clockwise through an angle 300 about an axis perpendicular to the paper. Determine the angle through which the reflected ray rotated.
K.C.S.E Physics Q & A - MODEL 1998PP2QN07
a) Fig. 6 shows an object, 0.3cm high placed in front of a concave mirror. C is the centre of curvature of the mirror. The diagram is drawn to scale:(1cm: 2cm)
Draw a ray diagram, on figure 6, and determine the size of the image produced.
b) Table 3 shows the object distance y and the corresponding image distance v, for an object placed in front of a concave mirror.
i) Complete the table and plot a graph of 1/v (y-axis) against 1/u (give your answers to 3 decimal places).
ii) From the graph, determine the focal length of the mirror.
K.C.S.E Physics Q & A - MODEL 1998PP1QN33
What is meant by virtual image?
ANSWER
K.C.S.E Physics Q & A - MODEL 1998PP1QN06
Figure 2 draw to scale shows a lens L1 placed 30cm fro an object O. The image is formed on the screen S 50cm from the lens.
K.C.S.E Physics Q & A - MODEL 1997PP1QN25
Figure 9 shows two parallel rays incident on a concave mirror. F is the focal point of the mirror
Sketch on the same diagram the path of the rays after striking the mirror
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