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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 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).

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 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).

A convex lens of focal length 10 cm is placed co-axially 5 cm away from a concave lens of focal length 10 cm . If an object is placed 30 cm in front of the convex lens, find the position of final image formed by the combined system.

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 . .

A convex lens of focal length 10 cm is placed coaxially 5 cm away from a concave lens of focal length 10 cm. If an object is placed 30 cm in front of the convex lens, find the position of the final image formed by the combined system.

(a) (i) Draw a labelled ray diagram to show the formation of image in an astronomical telescope for a distant object. (ii) Write three distinct advantages of a reflecting type telescope over a refracting type telescope. (b) A convex lens of focal length 10 cm is placed coaxially 5 cm away from a concave lens of focal length 10 cm. If an object is placed 30 cm in front of the convex lens, find the position of the image formed by the combined system.