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  4. A convex lens of focal length 100 cm and a concave lens of focal length 10 cm are placed coaxially at a separation of 90 cm. If a parallel beam of light is incident on convex lens, then after passing through the two lenses the beam

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Q. A convex lens of focal length $100 \,cm$ and a concave lens of focal length $10\, cm$ are placed coaxially at a separation of $90\, cm$. If a parallel beam of light is incident on convex lens, then after passing through the two lenses the beam

Ray Optics and Optical Instruments

Solution:

Virtual object for concave lens is at its focus.

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