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Class 10 light
(a) The variation of image distance (v) with object distance (u) for a convex lens is given in the following observation table. Analyse it and answer the questions that follow:

Without calculation, find the focal length of the convex lens. Justify your answer.
(II) Which observation is not correct? Why? Draw ray diagram to find the position of the image formed for this position of the object.
(III) Find the approximate value of magnification for u = -30 cm.
OR
(b) (i) Define principal axis of a lens. Draw a ray diagram to show what happens when a ray of light parallel to the principal axis of a concave lens passes through it.
(ii) The focal length of a concave lens is 20 cm. At what distance from the lens should a 5 cm tall object be placed so that its image is formed at a distance of 15 cm from the lens? Also calculate the size of the image formed.

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