If an object is placed at 60 cm before lens I focal length of lens I is 30 cm and focal length of lens II is 45 cm., find out the image distance formed by lens II from O.

180 cm

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120 cm

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60 cm

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90 cm

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Solution

The correct option is A
180 cm

For lens I, since object is at 2f (i.e. 60 cm) image of lens I is formed at 60 cm from a between lens I & II.

$\frac{1}{v}$ - $\frac{1}{u}$ = $\frac{1}{f}$

$\frac{1}{(v)}$ + $\frac{1}{60}$ = $\frac{1}{45}$

$\Rightarrow$ v = 180 cm

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If an object is placed at 60 cm before lens I focal length of lens I is 30 cm and focal length of lens II is 45 cm., find out the image distance formed by lens II from O.

The correct option is A 180 cm For lens I, since object is at 2f (i.e. 60 cm) image of lens I is formed at 60 cm from a between lens I & II. 1v - 1u = 1f 1(v) + 160 = 145 ⇒ v = 180 cm

The correct option is A
180 cm

For lens I, since object is at 2f (i.e. 60 cm) image of lens I is formed at 60 cm from a between lens I & II.

$\frac{1}{v}$ - $\frac{1}{u}$ = $\frac{1}{f}$

$\frac{1}{(v)}$ + $\frac{1}{60}$ = $\frac{1}{45}$

$\Rightarrow$ v = 180 cm