Q30 of 60 Page 1

Study the given diagram and select the correct statement about the device 'X':

The light rays coming from infinity gets reflected by the device ‘X’ and converge at a point at a distance of 12cm from it, it is a concave mirror of focal length 12 cm.

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28

A student identified the various parts of an embryo of a gram seed and listed them as given below:

(I) Testa


(II) Plumule


(III) Radicle


(IV) Cotyledon


(V) Tegmen


Out of these the actual parts of the embryo are:

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Four students A, B, C and D reported the following set of organs to be homologous. Who is correct?

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A student has obtained a point image of a distant object using the given convex lens.

To find the focal length of the lens he should measure the distance between the:

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Four student S P, Q, R and S traced the path of a ray of light passing through a glass slab for an angle of incidence 40° and measured the angle of refraction. The values as measured by them were 18°; 22°; 25° and 30° respectively. The student who has performed the experiment methodically is