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A point object is placed at 30 cm from a...

A point object is placed at 30 cm from a convex glass lens `(mu_(g) = (3)/(2))` of focal length 20 cm. The final image of object will be formed at infinity if

A

another concave lens of focal length 60 cm is placed in contact with the previous lens

B

another convex lens of focal length 60 cm is placed at a distance of 30 cm from the first lens

C

the whole system is immersed in a liquid of refractive index 4/3

D

the whole system is immersed in a liquid of refractive index 9/8

Text Solution

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The correct Answer is:
A, D
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Knowledge Check

  • A point object is placed at a distance of 30 cm from a convex mirror of focal length 30 cm. The image will form at

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    B
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  • An object is placed at 20 cm from a convex mirror of focal length 10 cm. The image formed by the mirror is

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    Real and at `20 cm` from the mirror
    B
    Virtual and at 20 cm from the mirror
    C
    Virtual and at `20//3 cm` from the mirror
    D
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