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27. A student traces the path of a ray of light passing through a rectangular glass slab:

For measuring the angle of incidence, he must position the protractor in the manner shown in figure:
(a) A                       (b) B                      (c) C                   (d) D

28. The adjoining figure shows the formation on an image by a convex lens on the white scree. The distance between the points P and Q gives the|:

(a) radius of curvature of the lens
(b) twice the focal length of the lens
(c) focal length of the lens
(d) aperture of the lens

 

27 b
28 c

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1. D
2. C
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27.its option b .because the protractor should be kept over angle of incidenceto be able to measure it
 
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28.option c as the distance between the screen and lens will be the focal length of the lens
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