21. See below the diagram.
f = 20 cm
1
-5 cm+ 30 cm
Calculate the focal length of concave lens with the help of above ray diagram. The focal
length of convex lens is 20 cm.
(2
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Answer:
utgrh551%5+frrf
Explanation:
vytgtjhuydivf51%+551/ %244445617555ghcchyschtxfjfj
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