A thin convex lens of focal length 5 cm and a thin concave lens of focal length 4 cm are combined together (without any gap) and this combination has magnification when an object is placed 10 cm before the convex lens. [2026]

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Solution

Q.
A thin convex lens of focal length 5 cm and a thin concave lens of focal length 4 cm are combined together (without any gap) and this combination has magnification $m_{1}$ when an object is placed 10 cm before the convex lens. Keeping the positions of the convex lens and object undisturbed, a gap of 1 cm is introduced between the lenses by moving the concave lens away, which leads to a change in magnification of the total lens system to $m_{2}$ . The value of $| \frac{m_{1}}{m_{2}} |$ is _________. [2026]

1 $\frac{5}{27}$

2 $\frac{3}{2}$

3 $\frac{25}{27}$

4 $\frac{5}{6}$

Ans.
(4)

(Dropped)

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