Question

# What is the position and nature of image formed by lens combination shown in figure? $$(f_1,f_2$$ are focal length $$)$$

A
70 cm from point B at left; virtual
B
40cm from point B at right ;real
C
203 cm from point B at right ,real
D
70cm from point B at right ,real

Solution

## The correct option is C $$70$$cm from point $$B$$ at right ,realFor first lens$$\dfrac{1}{V}-\dfrac{1}{-20}=\dfrac{1}{5}$$$$V=\dfrac{20}{3}$$For second lens$$V=\dfrac{20}{3}-2=\dfrac{14}{3}$$$$\dfrac{1}{V}-\dfrac{1}{\dfrac{14}{3}}=\dfrac{1}{-5}$$$$V=70cm$$PhysicsNCERTStandard XII

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