Question

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

Answer 1

A convex lens, of focal length 30 cm, a concave lens of focal length 120 cm, and a plane mirror are arranged as shown. For an object kept at a distance of 60 cm from the convex lens, the final image, formed by the combination, is a real image, at a distance of :

(1)60 cm from the convex lens(2)60 cm from the concave lens(3)70 cm from the convex lens(4) 70 cm from the concave lens

Answer 2

Answer:(-6)

Explanation:

For convex we will first find the v and it is 15 centimetre using lens formula and that will act as a u for concave lens concave lens is -15 and focal length for concave is the you I have calculated in a convex which is equal to minus 15 centimetre will act as an object distance equal to minus 15 CM for then from lens formula we can calculate calculate the V for V for concave lens which is equal to minus 6