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Q.

The combination of a convex lens (f = 18 cm) and a thin concave lens (f = 9 cm) is

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a

A concave lens (f = 18 cm) 

b

A convex lens (f = 18 cm)

c

A concave lens (f = 6 cm)

d

A convex lens (f = 6 cm) 

answer is A.

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Detailed Solution

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1F=1+18+1(9)F=18cm (i.e. concave lens) 

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