The figure below shows the path of a ray of light passing through a rectangular glass block placed in air
Calculate the refractive index of glass (2mks)
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 The figure below shows an object placed in front of a concave mirror. By use of correct ray diagram, locate the position of image
Solution
K.C.S.E Physics Q & A - MODEL 2019PP2QN17
(a) Figure 10 shows a ray of light travelling from glass to air.
​Determine the:
(i) critical angle of the glass — air interface (ii) refractive index of glass (b) Apiece of metal is embedded at the centre of an ice block 15cm from the surface of the ice. Given that the refractive index of ice is 1.32, determine how far from the surface of the ice block the metal appears to be. (c) Figure 11 shows, two rays of incident on a diverging lens. 
Complete the ray diagram to show the path of the rays after passing through the lens.
(d) (i) State two differences between the human eye and a camera lens. (ii) State the name of the part of the eye that enable the lens to focus images of objects at different distances. ​
ANSWERS
​(d)(i) Eye has a variable focal length whole the focal length of camera lens is fixed
Image distance from the lens is almost constant in the eye while in a camera it can be varied Eye lens is muscle while glass/clear plastic (ii) Ciliary muscles K.C.S.E Physics Q & A - MODEL 2018PP2QN05
​The angle of incident for a ray of light moving from air to a certain liquid is 30. Given that the refractive index of the Liquid is 1 .36, determine the angle of refraction.
answer
K.C.S.E Physics Q & A - MODEL 2017PP2QN15
​(a) Figure 5 shows the interface between glass and air.
​Draw on the figure a ray diagram to illustrate the critical angle.
(b) Figure 6 shows a ray of light incident at right angles to face AB of a right angled glass prism of refractive index 1.62. 
​(i) Determine the critical angle of the material.
(ii) Complete the ray diagram to show the path of light until it leaves the prism. (c)State any two applications of prisms.
answers
​(c)- Dispersion of white light
- In periscopes - In Binoculars - In telescopes K.C.S.E Physics Q & A - MODEL 2016PP2QN09
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 2016PP2QN01
​Figure 1 shows a ray of light incident on a mirror at an angle of 45°.Another mirror is placed at an angle of 45° to the first one as shown.
​Sketch the path of the ray until it emerges.
answer
K.C.S.E Physics Q & A - MODEL 2015PP2QN10
A nail at the bottom of a beaker containing glycerine appears to be 6.8 cm below the surface of glycerine. Determine the height of the column of glycerine in the beaker. (take the refractive index of glycerine as 1.47)
answer
K.C.S.E Physics Q & A - MODEL 2013PP2QN06
Figure 3 shows a ray of light passing into a glass prism ABC.
Sketch the path of the ray as it travels from face AC. (critical angle for glass is 42o)
answer
K.C.S.E Physics Q & A - MODEL 2012PP2QN05
​Figure 5, shows an object O at the bottom of a beaker full of a liquid. An observer above the beaker sees its image at point X inside the liquid.
​Determine the refractive index of the liquid.
answer
K.C.S.E Physics Q & A - MODEL 2012PP2QN02Figure 2, shows two mirrors PQ and QR inclined at an angle of 1100. A ray of light is incident on mirror PQ at an angle of 600 |
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