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Q.

Variation of  v with u for a spherical mirror is as shown in figure. This curve is a hyperbola. A straight line of unit slope intersects the hyperbola at point ‘A’. If the focal length of mirror is 20 cm, coordinates of point A are:

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a

20 cm, 10 cm

b

40 cm, 40 cm

c

40 cm, 20 cm

d

20 cm, 20 cm

answer is B.

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Detailed Solution

The coordinate of point  A are 2f,2f.
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