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To find the focal length of a concave mirror Rahul focuses a distant object with this mirror. The chosen object should be

To find the focal length of a concave mirror, a distant object is to be focused with the mirror. The chosen object should be a tree because of the limited distance and height.

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24

(a) What is fragmentation in organism? Name a multicellular organism which reproduces by this method.

(b) What is regeneration in organisms? Describe regeneration in Planaria with the help of a suitable diagram.

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Following signs are usually shown on the bottles of commercial acetic acid. The symbols indicate respectively that acetic acid is:

 27

For finding the focal length of a convex lens by obtaining the image of a distant object, one should use as the object

 28

Four student A, B, C and D traced the paths of incident ray and the emergent ray by fixing pains P and Q for incident ray and pains R and S for emergent ray for a ray of light passing through a glass slab.


The correct emergent ray was traced by the student: