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Standard X

Physics

Lens Formula

A convex lens...

Question

A convex lens $L_{1}$ of focal length $20 c m$ and a concave lens $L_{2}$ of focal length $5 c m$ are kept along the same axis as shown in figure.
To achieve emergent ray from lens $L_{2}$ to be parallel to incident ray, the distance between two lenses should be equal to

15 c m

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22.2 c m

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25 c m

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20 c m

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Solution

The correct option is C $25 c m$
Option C is correct

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A convex lens L1 of focal length 20 cm and a concave lens L2 of focal length 5 cm are kept along the same axis as shown in figure.To achieve emergent ray from lens L2 to be parallel to incident ray, the distance between two lenses should be equal to

The correct option is C 25 cmOption C is correct

A convex lens $L_{1}$ of focal length $20 c m$ and a concave lens $L_{2}$ of focal length $5 c m$ are kept along the same axis as shown in figure.
To achieve emergent ray from lens $L_{2}$ to be parallel to incident ray, the distance between two lenses should be equal to

The correct option is C $25 c m$
Option C is correct