You are given three lenses `L_(1),L_(2) and L_(3)` each of focal length 20 cm. An object is kept at 40 cm in front of `L_(1),` as shown. The final real image is formed at the focus 'I' of `L_(3).` Find the separations between `L_(1),L_(2) and L_(3).`

You are given three lenses L_(1),L_(2) and L_(3) each of focal length 10 cm. An object is kept at 15 cm in front of L_(1), as shown. The final real image is formed at the focus 'T' of L_(3). Find the separations between L_(1),L_(2) and L_(3).

You are given three lenses L_(1),L_(2) and L_(3) each of focal length 10 cm. An object is kept at 15 cm in front of L_(1), as shown. The final real image is formed at the focus 'T' of L_(3). Find the separations between L_(1),L_(2) and L_(3).

Your are given three lenses L_(1), L_(2) and L_(3) each of focal length 20cm. An object is kept at 40cm in front of L_(1) as shown. The final real image is formed at the focus I of L_(3) . Find the separation between L_(1) and L_(2) and L_(3) .

You are given three lenses L_1,L_2 and L_3 each of focal lenth 15 cm.An object is kept at 20 cm in front of L_1 as shown in Fig.2.87. The real image is formed at the focus I of L_3 .Find the separations between L_1,L_2 and L_3 . .

Three lenses L_1,L_2,L_3 each of focal length 30 cm are placed co-axially as shown in (Fig. 11(b).57). An object is held at 60 cm from the optic centre of lens L_1 . The final real image is formed at the focus of L_3 . Calculate separation between (i) L_1 and L_3 (ii) L_2 and L_3 ? .

(a) Explain with reason, how the power of a diverging lens changes when (i) it is kept in a medium of refractive index greater than that of the lens, (ii) incident red light is replaced by violet light. (b) Three lenses L_(1), L_(2), L_(3) each of focal length 30 cm are placed co-axially as shown in the figure. An object is held at 60 cm from the optic center of lens L_(1) . The final real image is formal at the focus of L_(3) . Calculate the separation between (i) (L_(1) and L_(2)) and " (ii) " (L_(2) and L_(3)) .

(a) Explain with reason, how the power of a diverging lens changes when (i) it is kept in a medium of refractive index greater than that of the lens, (ii) incident red light is replaced by violet light. (b) Three lenses L_(1), L_(2), L_(3) each of focal length 30 cm are placed co-axially as shown in the figure. An object is held at 60 cm from the optic center of lens L_(1) . The final real image is formal at the focus of L_(3) . Calculate the separation between (i) (L_(1) and L_(2)) and " (ii) " (L_(2) and L_(3)) .

In the network in given find l_(1), l_(2) and l.