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A simple microscope consists of a concave lens of power `-10D` and convex lens of power `+20D` in contact. If the image formed at infinity, then calcu

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A simple microscope consists of a concave lens of power `-10D` and convex lens of power `+20D` in contact. If the image formed at infinity, then calculate the magnifying power `(D=25cm`)
A. `2.5`
B. `3.5`
C. `2.0`
D. `3.0`
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(a) Power of combination
`P=P_(1)+P_(2)`
`P=+20-10=+10D`
`F=1/P=1/10m=100/10cm=10cm`
For final image at infinity
`M=D/F=25/10=2.5`
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