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  4. A convex lens of focal length 25 cm is placed at a distance x from a concave lens of focal length 7 cm. When a parallel beam is incident on the convex lens, it emerges as a parallel beam out of the concave lens. The value of x is

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Q. A convex lens of focal length 25 cm is placed at a distance x from a concave lens of focal length 7 cm. When a parallel beam is incident on the convex lens, it emerges as a parallel beam out of the concave lens. The value of x is

Ray Optics and Optical Instruments

Solution:

Here $f_2=x+f_1$
$When\,x=f_2-f_1=18\, cm$