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Types of spherical lenses

a thin convex...

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a thin convex lens of focal length 20 cm is kept in contact with a plane mirror.The focal length of this cobination will be

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Q. A thin convex lens of focal length 20 cm is kept in contact with a plane mirror. The focal length of the combination will be :

Q. A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a convex mirror of focal length

Q. A thin converging lens of focal length

25

cm is kept in contact with a thin diverging lens of focal length

20

cm. Focal length of the combination is:-

Q. A convex lens of focal length 10 cm is placed in contact with a concave lens of focal length 20 cm. The focal length of this combination of lenses will be:
(a) +10 cm
(b) +20 cm
(c) −10 cm
(d) −20 cm

Q. What will be the resultant focal length of the combination when a thin convex lens is kept in contact with a thin concave lens ?

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