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Q.

An object is placed first at infinity and then at 20 cm from the object side focal plane of the convex lens. The two images thus formed are 5 cm apart. The focal length of the lens is

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a

5 cm

b

10 cm

c

15 cm

d

20 cm

answer is B.

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Detailed Solution

For first case :1f=1v−1∞⇒f=v For second case  1f=1(f+5)−1−(f+20)⇒f=10cm  Alternative sol. −f2=x1x2⇒f=10cm
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