State two uses of optical fibres whose working relies on total internal reflection (2mks)
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 K.C.S.E Physics Q & A - MODEL 2019PP1QN02
​Figure 1 shows a defective straw used to suck milk from a glass.
​It was observed that upon sucking the straw, milk did not rise up the straw. Explain this observation.
answer
K.C.S.E Physics Q & A - MODEL 2014PP2QN12
​Draw a ray diagram to show how a ray of light may be totally internally reflected two times in an isosceles right - angled glass prism. (Assume that the critical angle of glass is 42°)
answer
K.C.S.E Physics Q & A - MODEL 2008PP2QN16
​(a) State two conditions necessary for total internal reflection to occur
(b) Figure 9 shows a ray of light incident on the boundary between two media 1 and at an angle 
​Show that the refractive index for a ray of light traveling from medium 1 to medium 2 is given by:
M2 = 1/Sin θ (c) Figure 10 shows a ray of light incident on one face of a block of ice of refractive index 1. 31 and totally reflected at the adjacent face 
​Determine
(i) Angle Φ (ii) Angle x (iii) Angle θ, the greatest angle for which the total internal reflection is possible
answers
K.C.S.E Physics Q & A - MODEL 2003PP1QN15
​One of the conditions for total internal reflection to occur is that angle of incidence must be greater than the critical angle of the medium. State the other condition
answer
K.C.S.E Physics Q & A - MODEL 2003PP1QN08
​ Figure 6 shows a ray of light being reflected from a mirror.
What is the angle of reflection?
answer
K.C.S.E Physics Q & A - MODEL 1997PP1QN10
Figure 4 shows two point objects A, and B, placed in front of a mirror M
Sketch a ray diagram to show the positions of their images as seen by the eye.
answers
K.C.S.E Physics Q & A - MODEL 1996PP1QN22
A lady holds a large concave of facal length 1 m, 80 cm from her face, state two characteristics of her image in the mirror
ANSWERS
K.C.S.E Physics Q & A - MODEL 1996PP1QN08
A vertical object placed on a bench is observed to have three shadows of different sharpness, in different directions. Explain this observation
answers
K.C.S.E Physics Q & A - MODEL 1995PP2QN04
Draw a ray diagram to show how a convex lens works as a magnifying glass
answers
K.C.S.E Physics Q & A - MODEL 1995PP2QN04
The diagram in figure 3 shows a certain eye defect
​(i) Name the object
(ii) Draw on the same diagram an arrangement to correct the defect (c) (i) Explain why a pail of water can be swung in vertical circle without the water pouring out (ii) A car of mass 1200kg is moving with a velocity of 25ms-1 around a flat bend of radius 150m. Determine the minimum frictional force between the tyres and the road that will prevent the car from sliding off.
answers
K.C.S.E Physics Q & A - MODEL 1995PP2QN03
(a) An object O is placed in front of convex mirror as shown in figure 2
(i) Draw to scale a ray diagram to show the position of the image
(ii) Determine the magnification (b) An object placed in front of a convex lens of focal length 10 cm produces an image at a distance of 15 cm from the lens and on the same sides as the object Determine the position of the object
K.N.E.C MARKING SCHEME
K.C.S.E Physics Q & A - MODEL 1995PP1QN36
Explain with the aid of a labeled ray diagram the wide field of view of a convex mirror
K.N.E.C MARKING SCHEME
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