Q32 of 58 Page 1

Select from the following the best experimental set-up for tracing the path of a ray of light passing through a rectangular glass slab:


From the above experiment S is found to be most appropriate looking at the angle of incidence made at the line normal to the surface of glass slab.

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30

A student obtained a sharp image of a candle flame placed at the distant end of the laboratory table on a screen using a concave mirror to determine its focal length. The teacher suggested him to focus a distant building about 1km far from the laboratory, for getting more correct value of the focal length. In order to focus the distant building on the same screen the student should slightly move the

 31

To determine the approximate focal length of the given convex lens by focussing a distant object (say, a sign board), you try to focus the image of the object on a screen. The image you obtain on the screen is always:

 33

Study the following figure in which a student has marked the angle of incidence (), angle of refraction (), angle of emergence (), angle of prism () and the angle of deviation (). The correctly marked angles are:

 34

What do you observe when you drop a few drops of acetic acid to a test tube containing:

(i) phenolphthalein


(ii) distilled water


(iii) universal indicator


(iv) sodium hydrogen carbonate powder