Q2 of 60 Page 1

What is the magnification of the images formed by plane mirrors and why?

The magnification of the image formed by a plane mirror is 1 because size of the image is equal to the size of the object. Magnification m=Hi/Ho = 1.


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36

To find the image-distance for varying object-distances in case of a convex lens, a student obtains on a screen a sharp image of a bright object placed very far from the lens. After that he gradually moves the object towards the lens and each time focuses its image on the screen.

(a) In which direction-towards or away from the lens, does he move the screen to focus the object?


(b) What happens to the size of image-does it increase or decrease?


(c) What happen when he moves the object very close to the lens?

 1

Write the name and formula of the 2nd member of homologous series having general formula CnH2n+2

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What is meant by power of a lens?

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Write two differences between binary fission and multiple fission in a tabular form.