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Question

What is the position and nature of image formed by lens combination shown in figure? 
$$(f_1,f_2 $$ are focal length $$)$$
1333298_bea5bb1638e4417cb287f2a8130616ab.PNG


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

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

Physics
NCERT
Standard XII

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