. An object is placed 21.4 cm to the left of a convex lens of focal length 15 cm. A second concave lens is placed 20 cm to the right of the convex lens and a final real, inverted image of the object is projected on a screen located 66.8 cm to the right of the concave lens. Calculate the focal length of the concave lens.
. An object is placed 21.4 cm to the left of a convex lens of focal length 15 cm. A second concave lens is placed 20 cm to the right of the convex lens and a final real, inverted image of the object is projected on a screen located 66.8 cm to the right of the concave lens. Calculate the focal length of the concave lens.
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Transcribed Image Text:12. An object is placed 21.4 cm to the left of a convex lens
of focal length 15 cm. A second concave lens is placed
20 cm to the right of the convex lens and a final real,
inverted image of the object is projected on a screen
located 66.8 cm to the right of the concave lens.
Calculate the focal length of the concave lens.
Ans.: -55 cm
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