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Lens Formula

Q 9/10 Two co...

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Q 9/10 Two convex lenses of focal length 20 cm each areplaced coaxially with a separation of 60 cm between them. The distance of image formed of a distantobject by the combination from rear lens is

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Q. Two convex lenses of focal length 20 cm each are placed coaxially with a separation of 60 cm between them. The distance of image formed of a distant object by the combination from rear lens is

Q. Two convex lenses of focal length

20 cm

each are placed coaxially with a separation of

60 cm

between them. Find the equivalent focal length of the combination and also comment on the nature of lens.

Q. A convex lens of focal length

20 c m

is placed coaxially with a concave mirror of focal length

10 c m

at a distance of

50 c m

apart from each other. A beam of light coming parallel to the principal axis is incident on the convex lens. Find the position of the final image formed by this combination.

Q. A convex lens of focal length 20 cm is placed coaxially with a convex mirror of radius of curvature 20 cm. The two are kept at 15 cm from each other. A point object placed 40 cm in front of the convex lens. Find the position of the image formed by this combination.

Q. A convex lens of focal length

40 c m

is held at a distance

12 c m

coaxially above a concave mirror of focal length

18 c m

. If the convex lens is replaced by a concave lens of focal length

60 c m,

it gives rise to an image coincident with itself. Then the object distance

d

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