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Question:

What is the position and nature of image formed by lens combination shown in figure?

70cm from pointBat left; virtual

40cm from pointBat right ;real

203cm from pointBat right ,real

70cm from pointBat right ,real

Solution:

For first lens
1/V - 1/u = 1/f
1/V - 1/(-60) = 1/15
V = 203
For second lens
V = 203 - 60 = 143
1/V - 1/u = 1/f
1/V - 1/143 = 1/10
V = 70cm